20 Best Car Battery Cut Off Switch [2024]

Are you looking for the best Car Battery Cut Off Switch? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Car Battery Cut Off Switch.

We Recommended:

# Preview Product
1 Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut... Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect...
2 Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat... Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat...
3 Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle,... Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car,...
4 Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car, Vehicle,... Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car,...
5 Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut... Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut...
6 Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine Car... Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine...
7 Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut... Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect...
8 Big Autoparts Battery Quick Disconnect Switch 5V 12V 24V Battery Cut Off Switch for Car RV PV Boat... Big Autoparts Battery Quick Disconnect Switch 5V 12V 24V Battery Cut Off Switch for Car RV PV...
9 Battery Doctor Knife Switch Top Post Battery Disconnect for Auto Car RV Boat Truck Vehicle 12-24V... Battery Doctor Knife Switch Top Post Battery Disconnect for Auto Car RV Boat Truck Vehicle 12-24V...
10 12V-48V High Current Master Battery Disconnect Switch Kit,250A Continuous 1000A Intermittent... 12V-48V High Current Master Battery Disconnect Switch Kit,250A Continuous 1000A Intermittent...
11 High Current Battery Disconnect Switch 12V 500A Universal Battery Cut Off Switch Manual Battery Kill... High Current Battery Disconnect Switch 12V 500A Universal Battery Cut Off Switch Manual Battery...
12 GOGONFLY Master Battery Disconnect Switch, Heavy Duty Knife Blade 12V 24V Battery Cut Off Switch,... GOGONFLY Master Battery Disconnect Switch, Heavy Duty Knife Blade 12V 24V Battery Cut Off Switch,...
13 ATREPIN Battery Disconnect Switch,12V 24V 48V Battery Power Cut Master Switch Disconnect Isolator... ATREPIN Battery Disconnect Switch,12V 24V 48V Battery Power Cut Master Switch Disconnect Isolator...
14 High Current Battery Disconnect Switch 12V 500A Universal Remote Battery Cut Off Switch Anti-Theft... High Current Battery Disconnect Switch 12V 500A Universal Remote Battery Cut Off Switch...
15 CZC AUTO Battery Quick Disconnect Switch Side Post Battery Shut/Cut Off Switch Side Terminal Battery... CZC AUTO Battery Quick Disconnect Switch Side Post Battery Shut/Cut Off Switch Side Terminal...
16 AWBLIN Battery Disconnect Switch 12V 24V 48V Master Isolator Cut Off Switch for Marine Boat Car... AWBLIN Battery Disconnect Switch 12V 24V 48V Master Isolator Cut Off Switch for Marine Boat Car...
17 Top Post Battery Master Disconnect Switch Top Post Battery Master Disconnect Switch
18 Remote Battery Disconnect Switch 12V 180A Universal Battery Cut Off Switch Anti-Theft Battery Kill... Remote Battery Disconnect Switch 12V 180A Universal Battery Cut Off Switch Anti-Theft Battery...
19 Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor Knife... Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor...
20 GOGONFLY Top Post Battery Disconnect Switch, 12V 24V Knife Blade Master Switch, Battery Cut Off Shut... GOGONFLY Top Post Battery Disconnect Switch, 12V 24V Knife Blade Master Switch, Battery Cut Off...
Bestseller No. 1
Ampper Top Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut...
  • Compatible: used for top post terminal, 15-17 mm cone battery negative post only, DC 12 V system, rated current: 125 A, On/Off 2 position.
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • Heavy Duty: solid made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for Car, Vehicle, RV and Boat batteries which have a standard 15-17 mm cone top post terminal, also used for electrical equipment.
Bestseller No. 2
Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat...
  • 【COMPATIABLE】This knife-blade battery disconnect switch is suitable for TOP POST TERMINAL, battery NEGATIVE post only. Maximum Current: 750A,...
  • 【HIGH QUALITY & HEAVY DUTY 】This top post battery disconnect switch is made of brass material, corrosion resistance, conductive performance is...
  • 【EASY TO INSTALL】This battery doctor knife switch for top post batteries can be adjusted into a vertical knife switch through the bottom of the...
  • 【SAVE ELECTRYCITY】This knife blade master switch is used for the battery to isolate and secure the electrical system, eliminate any power draw...
  • 100% Customer satisfaction is our constant pursuit, we only provide good quality products for every buyer friend.If you have any problem during the...
Bestseller No. 3
Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle,...
  • Heavy Duty: ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short of circuits, equiped with 4 sets of...
  • Operation: On/Off 2 positions, 275 A continuous at DC 12V, 455 A intermittent at DC 12V, 1250 A momentary at DC 12V.
  • Compatible: used for DC 12 - 48 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.
  • Purpose: eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
  • Copper terminal stud size: 3/8" (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment's switch.
Bestseller No. 4
Ampper 12-24 V Master Battery Disconnect Switch, Battery Power Cut Isolator Killer for Car, Vehicle,...
  • Heavy Duty: all aluminium housing, durable made for safety use. Mounts in 3/4" hole, equiped with a face plate.
  • Operation: On/Off 2 positions, 200 A continuous at DC 12V, 400 A momentary at DC 12V.
  • Compatible: used for DC 12 - 24 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.
  • Purpose: eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
  • Copper terminal stud size: 3/8" (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment's switch.
Bestseller No. 5
Ampper Top Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator Power Cut...
  • Compatible: used for top post terminal, 15-17 mm cone / tapering battery NEGATIVE post only, DC 12V-24V system, 200A continuous and 600A momentary at...
  • Convenience: vertical knife blade type, easy to install & simple to use. Lift the knife, then power will cut.
  • Heavy Duty: solid brass made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for Car, Vehicle, RV and Boat batteries which have a standard 15-17 mm cone top post terminal, also used for electrical equipment.
Bestseller No. 6
Ampper Battery Disconnect Switch, Isolator Cut Off Power Kill Master Battery Switch for Marine Car...
  • Operation: used for DC 12-24 V systems, On/Off 2 position, rated current: 100A (12V ), Max. withstanding current: 150A (12V ).
  • Heavy Duty: ABS plastic and solid brass nuts / washers, rust and corrosion resistant, durable made for safety use.
  • Convenience: easy to install & simple to use, 2 removable keys, waterproof cover for key hole.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Size: 2 brass terminals: 3/8", 2 mounting holes: 3/16". Used for Car, Vehicle, RV and Boat, also electrical equipment's switch.
Bestseller No. 7
Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut...
  • Compatible: with a long bolt, used for side post terminal, battery negative post 3/8" hole only, DC 12 V system, rated current: 125 A, On/Off 2...
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • Heavy Duty: solid made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • Used for GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment.
SaleBestseller No. 8
Big Autoparts Battery Quick Disconnect Switch 5V 12V 24V Battery Cut Off Switch for Car RV PV Boat...
  • ❤Material: Heavy duty Brass alloy. For 6V, 12V and 24V battery systems
  • ❤Convenient Safety - Help isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
  • ❤High Standard - Battery cut off switch made of heavy duty Brass alloy.Durable zinc alloy terminal.
  • ❤Easy Installation - Battery operated switch to engage power just hand tighten the green knob,Slightly loosen the green knob to disconnect all...
  • ❤Helpful Choice - This battery cutoff switch rust and corrosion resistant.Extends the life of your vehicle's battery.
SaleBestseller No. 9
Battery Doctor Knife Switch Top Post Battery Disconnect for Auto Car RV Boat Truck Vehicle 12-24V...
  • Fitments: The knife blade battery switch can be used on car marine boat RV ATV at top post position for 12-24V battery.
  • Installation: Firstly, disconnect the cable connection on the battery. Make sure the negative cable is always disconnected, then the positive cable....
  • Solid Material: The knife switch is made of brass with electroplated surface, which has a good conductive performance and is totally rust and...
  • Easy Usage: Just lever up the connect, then the battery will be cut off. In case your vehicle has to be stopped for a long time, you can only cut off...
  • Warranty: We offer one year warranty for the blade switch. If you are not satisfied with it, simply contact us and get your refund.
Bestseller No. 10
12V-48V High Current Master Battery Disconnect Switch Kit,250A Continuous 1000A Intermittent...
  • ✔ Battery disconnect switch are 100% brand new and made of high material.Sturdy and Durable.
  • ✔ High Current (250A Continuous/1000A Intermittent) Battery Disconnect Switch with Black On/Off Plate
  • ✔ Contains A high-current power-off switch,A black indicating disc,2 x Heat shrinkable tube,4 x Rubber Insulator,2 x 3/8" copper lugs
  • ✔ Safety battery disconnects switch universal applied for street roads,RVs,trailers,or any vehicle where a battery cut off switch is required.Meet...
  • ✔ Easy to Use Kit for a Professional Installation
Bestseller No. 11
High Current Battery Disconnect Switch 12V 500A Universal Battery Cut Off Switch Manual Battery Kill...
  • Car Battery Disconnect Switch: When you leave the car for a long time, the battery is still working. This product controls your car's power system,...
  • High Current Kill Switch: Rated current 500A, rated voltage 12V. This battery cut off switch is specially designed for large displacement vehicles,...
  • Reduce Battery Consumption: This battery cut off switch only needs a weak standby current of 0.005A, which is much lower than the standby current of...
  • Manual Battery Shut off Switch: There is a manual kill switch in the package that you can install in the cab or anywhere else convenient for you, and...
  • Easy to Install: This battery shut off switch is equipped with two 0.5-meter auxiliary cables and a pure copper screw for installation for special...
SaleBestseller No. 12
GOGONFLY Master Battery Disconnect Switch, Heavy Duty Knife Blade 12V 24V Battery Cut Off Switch,...
  • HEAVY-DUTY DISCONNECT SWITCH: This reliable battery kill switch employs structural steel copper plated to provide perfect isolation and preservation...
  • HIGH VERSATILITY: Able to handle 12-24V of 250A continuous and 750A momentary at DC 12V, our master battery cutoff switch works with top post...
  • EASY TO INSTALL & USE: assemble the battery shut off switch to the negative cable. Turns power on and off by just lifting the lever up or down, on/off...
  • NO MORE DRAINED BATTERY: batteries that are empty and not charged for a long time will shorten the life causing you to replace it. This battery cutoff...
  • USER-FRIENDLY DESIGN: This shutoff switch easily adjusts to fit snugly around cathode terminals 0.59-0.66 in. (15-17 mm) in diameter; the plastic...
SaleBestseller No. 13
ATREPIN Battery Disconnect Switch,12V 24V 48V Battery Power Cut Master Switch Disconnect Isolator...
  • STURDY & FULLY ENCLOSED SHUT OFF SWITCH: The Heavy Duty Cut Off Switch is made of ABS plastic housing and copper tin plating inner stud. Fully...
  • COMPATIBILITY & SAFETY: This Battery Kill Switch Used for DC 12 - 48V systems to isolate and secure the electrical system; eliminate any power draw...
  • Operation:On/Off 2 position, Suitable for various 12 V/24 V/48 V systems. On/Off 2 positions, 275 A continuous at DC 12V, 455 A intermittent at DC...
  • Copper terminal stud size: 3/8" (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment's switch.
  • PACKAGE INCLUDE: Equiped with 1* Battery Switch, 4 Pcs Mounting Bolts, 4 Pcs 2*3/8 Copper Ring Terminals, 4 Pcs Heat Shrink Tubings and a hex wrench,...
Bestseller No. 14
High Current Battery Disconnect Switch 12V 500A Universal Remote Battery Cut Off Switch Anti-Theft...
  • Car Battery Disconnect Switch: When you leave the car for a long time, the battery is still working. This product controls your car's power system,...
  • High Current Kill Switch: Rated current 500A, rated voltage 12V. This battery cut off switch is specially designed for large displacement vehicles,...
  • Remotely Disconnect the Power: This battery disconnect switch moves the trigger from under the hood to your hand, you don't need to open the hood...
  • Reduce Battery Consumption: This battery cut off switch only needs a weak standby current of 0.005A, which is much lower than the standby current of...
  • Easy to Install: This battery shut off switch is equipped with two 0.5-meter auxiliary cables and a pure copper screw for installation for special...
Bestseller No. 15
CZC AUTO Battery Quick Disconnect Switch Side Post Battery Shut/Cut Off Switch Side Terminal Battery...
  • Durable&High Quality: The battery cut off switch is made of zinc alloy with brass plating, corrosion resistance. Used for battery negative post 3/8"...
  • Disconnect Switch for Auto/Marine Battery: The on/off switch is to be used for side battery terminals. It is designed to prevent battery from draining...
  • Easy to Install and Operate: Knob type. Turn to the left (counterclockwise) to break the battery connection and turn to the right (clockwise) to...
  • Widely Used: Used for GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment
  • Rest Assured to Purchase: We offer 30-day money-back for any reason, 12-month warranty for quality-related issues. Any problem in using our battery...
SaleBestseller No. 16
AWBLIN Battery Disconnect Switch 12V 24V 48V Master Isolator Cut Off Switch for Marine Boat Car...
  • STURDY & FULLY ENCLOSED SHUT OFF SWITCH: The Heavy Duty Cut Off Switch is made of ABS plastic housing and copper tin plating inner stud. Fully...
  • COMPATIBILITY & SAFETY: This Battery Kill Switch Used for DC 12 - 48V systems to isolate and secure the electrical system; eliminate any power draw...
  • EASY TO OPERATE: On/Off 2 position, Suitable for various 12 V/24 V/48 V systems. Current voltage: rating at 275 A continuous (1 hour) at 48 V DC and...
  • WIDELY APPLICATION: Battery isolator switch is universal used for RV, Marine, Car, Boat, Camper, Travel Trailer, Truck, ATV, UTV battery and other...
  • PACKAGE INCLUDE: Equiped with 1* Battery Switch, 4 Pcs Mounting Bolts, 4 Pcs 2*3/8 Copper Ring Terminals, 4 Pcs Heat Shrink Tubings and a hex wrench,...
Bestseller No. 17
Top Post Battery Master Disconnect Switch
  • Ideal for car, truck, boat or RV battery
  • Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
  • Heavy Duty: solid brass made, rust and corrosion resistant, durable made for safety use.
  • Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use,...
SaleBestseller No. 18
Remote Battery Disconnect Switch 12V 180A Universal Battery Cut Off Switch Anti-Theft Battery Kill...
  • Remote Car Battery Disconnect System: When you leave the car for a long time, the battery is still working. This product remotely controls your car's...
  • Battery Disconnect Switch: Rated current 180A, rated voltage 12V, instantaneous current: 450A. the battery disconnect switch fits for cars, ATV, UTV,...
  • Reduce Battery Consumption: This battery cut off switch only needs a weak standby current of 0.005A, which is much lower than the standby current of...
  • Easier to Disconnect the Power: This remote control electromagnetic switch moves the trigger from under the hood to your hand, so you don't need to...
  • Easy to Install: The remote control battery switch adopts the method of negative connection, the performance stable. It has a simple wrench for...
SaleBestseller No. 19
Top Post Battery Disconnect Switch for Auto Car RV Marine Boat Truck Vehicle, 12V 24V Doctor Knife...
  • 【COMPATIBLE】This knife blade battery disconnect switch works well for RVs, marine, cars, boats or UTV- all standard car electric system as long as...
  • 【TOP MOUNT】Fit for top post terminal with 15-17mm cone, DC 12V-24V system, 250A continuous and 750A crank at DC 12V, on/off 2 position, operate...
  • 【HIGH-QUALITY】Our battery kill switch is made of solid brass and copper. It features superior performance and good conductivity. It also can be...
  • 【EASY TO USE】Knife blade type, easy to install & simple to use. When you are not using the car or it is stored for long periods, just simply raise...
  • 【INSTALLATION】 Firstly, disconnect the battery cables from the battery, always disconnect the negative cable first followed by the positive cable....
Bestseller No. 20
GOGONFLY Top Post Battery Disconnect Switch, 12V 24V Knife Blade Master Switch, Battery Cut Off Shut...
  • HEAVY-DUTY DISCONNECT SWITCH: This reliable battery kill switch employs structural steel copper plated to provide perfect isolation and preservation...
  • HIGH VERSATILITY: Able to handle 12-24V of 250A continuous and 750A momentary at DC 12V, our master battery cutoff switch works with top post...
  • EASY TO INSTALL & USE: assemble the battery shut off switch to the negative cable. Turns power on and off by just lifting the lever up or down, on/off...
  • NO MORE DRAINED BATTERY: batteries that are empty and not charged for a long time will shorten the life causing you to replace it. This battery cutoff...
  • USER-FRIENDLY DESIGN: This shutoff switch easily adjusts to fit snugly around cathode terminals 0.59-0.66 in. (15-17 mm) in diameter; the plastic...

Having trouble finding a great Car Battery Cut Off Switch?

This problem is well understood by us because we have gone through the entire Car Battery Cut Off Switch research process ourselves, which is why we have put together a comprehensive list of the best Car Battery Cut Off Switchs available in the market today.

After hours of searching and using all the models on the market, we have found the best Car Battery Cut Off Switch for 2023. See our ranking below!

How Do You Buy The Best Car Battery Cut Off Switch?

Do you get stressed out thinking about shopping for a great Car Battery Cut Off Switch? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Car Battery Cut Off Switch, which is why we have assembled a comprehensive list of the greatest Car Battery Cut Off Switch available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Car Battery Cut Off Switch that you consider buying. Your questions might include the following:

  • Is it worth buying an Car Battery Cut Off Switch?
  • What benefits are there with buying an Car Battery Cut Off Switch?
  • What factors deserve consideration when shopping for an effective Car Battery Cut Off Switch?
  • Why is it crucial to invest in any Car Battery Cut Off Switch, much less the best one?
  • Which Car Battery Cut Off Switch are good in the current market?
  • Where can you find information like this about Car Battery Cut Off Switch?

We’re convinced that you likely have far more questions than just these regarding Car Battery Cut Off Switch, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Car Battery Cut Off Switch, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Car Battery Cut Off Switch. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Car Battery Cut Off Switch buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Car Battery Cut Off Switch currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Car Battery Cut Off Switch has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Car Battery Cut Off Switch?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Car Battery Cut Off Switch.
  5. Customer Ratings: Number ratings grade Car Battery Cut Off Switch objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Car Battery Cut Off Switch.
  7. Product Quality: You don’t always get what you pay for with an Car Battery Cut Off Switch, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Car Battery Cut Off Switch is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Car Battery Cut Off Switch information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Car Battery Cut Off Switch is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

Related Post:

FAQ:

Q: How do you disconnect a battery in a car?

A: Disconnect the battery then unscrew the brackets holding it in its tray. Car batteries are heavy so lift the battery up, out of its tray with care. Use diluted baking soda mixture with old toothbrush to brush the tray and connectors. Do not put the new battery before they dry.

Q: Can I Disconnect my battery while the car is running?

A: In theory, if your alternator is working and providing power to the car while charging your battery, then once the car is started, disconnecting the battery shouldn’t cause the engine to stop running.

Q: How to disconnect auto battery?

A: 1. Take the necessary precautions before you try to disconnect your battery. Besides holding a potentially lethal electrical charge, batteries …Turn off the ignition.Wear safety goggles and gloves to protect your eyes and hands. {“smallUrl”:”https://www.wikihow.com/images/thumb/8/88/Disconnect-a-Car-Battery-Step-2-Version-7.jpg/v4-460px-Disconnect-a-Car-Battery … 3. Determine what size socket you need to loosen the nut on the negative terminal. Always work on the negative terminal before the positive when …

Q: What is a battery kill switch?

A: A Battery Kill Switch For Security And Safety. A kill switch will shut down a running engine without damaging the alternator, while a master/disconnect switch may or may not kill the engine, its job being to isolate the battery from the rest of the electrical system while the engine is not running.