How to Attach a Car Battery-Mounted Power Cut-off Switch | YourMechanic Advice

How to Attach a Car Battery-Mounted Power Cut-off Switch

Many people who store their vehicle for a length of time like to disconnect the battery from the electrical system of the vehicle. This prevents the vehicle from unintentionally draining the battery. With the battery disconnected, the risks of sparking and fire are also lessened dramatically.

Disconnecting the battery is generally accepted to be a safe storage practice because you never know what kind of furry critters or outside forces could cause an unexpected electrical problem during long-term storage.

Rather than using tools to disconnect your battery cables each time, a battery disconnect device (also known as a power cut-off switch) can be easily installed at the battery, and the power can be disconnected in a matter of seconds using a knob.

Part 1 of 1: Safely install a battery disconnect switch onto your vehicle

Materials Needed

Step 1: Locate the battery in your vehicle. Most car and truck batteries are located under the hood of the vehicle, but in some models, they may be located under the rear seat, or in the trunk.

wrench on cable end

Step 2: Remove the negative battery cable. Disconnect the negative battery cable using a wrench.

  • Tip: On older American vehicles, you would need a 7/16 or 1/2 inch wrench to do this. On newer or foreign vehicles, a 10-13mm wrench is most commonly used to disconnect the battery cable.

cut of switch attached to battery

Step 3: Install the battery cutoff switch. Install the battery cut-off switch onto the negative battery terminal, and tighten it on with the appropriate size wrench.

Ensure that the switch is set to the open position.

negative battery cable connected

Step 4: Connect the negative terminal to the cutoff switch. Now connect the factory negative battery terminal to the battery disconnect switch, and tighten it using the same wrench.

Step 5: Activate the switch. This is typically done by turning a knob that is part of the battery cutoff switch.

hand turning switch

Step 6: Test the battery switch. Test the battery switch in the “On” and “Off” positions to make sure that it is working as expected.

Once functionality is confirmed, visually inspect the battery and connections to confirm that nothing else is coming in contact with the battery terminals or newly added battery cut-off switch.

Whether you are storing your vehicle for a period of time, or you have a vehicle that drains your battery for unknown reasons, a battery terminal disconnect is an easy solution.

If disconnecting your battery on a regular basis due to a drain isn’t the solution of your choice, consider getting a certified mechanic from YourMechanic to inspect the battery if it is dead and replace it.


Next Step

Schedule Oil Change

The most popular service booked by readers of this article is Oil Change. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Oil Change reviews

Excellent Rating


YourMechanic Oil Change Service

Average Rating

4.9/5

Number of Reviews

20,442

Rating Summary
19,168
828
169
84
193
19,168
828
169
84
193

Jimmi

26 years of experience
90 reviews
Jimmi
26 years of experience
Chevrolet Venture - Oil Change - Orlando, Florida
Mr. Jimmi Phillips is a true professional. Finally, found a mechanic who is not only knowledgeable but who understands that his profession is not work but an avocation. Jimmi provides expert service that allows one to feel most confident in the work being provided. Quality, value, integrity, and service best describes Mr. Phillips.
Honda Accord - Oil Change - Orlando, Florida
Showed up a little ahead of time. Fixed my idling problem and gave advice if there were future problems with it. I'm happy.

Johnathon

8 years of experience
89 reviews
Johnathon
8 years of experience
Lexus ES350 - Oil Change - Fresno, California
We love Jonathan. He is knowledgeable, professional, trustworthy, and did a terrific job. Thank you.

Joe

14 years of experience
408 reviews
Joe
14 years of experience
Nissan Altima - Oil Change - Antioch, Tennessee
I have booked Joe several times at this point and I feel he is very knowledgeable and patient when explaining needed repairs to me. He communicates well and has a pleasant manner and disposition. I have never felt that he would suggest a service that was not needed, which has not always been the case when I used to take my car to a dealership for service.

Michael

21 years of experience
49 reviews
Michael
21 years of experience
Audi A4 - Oil Change - Las Vegas, Nevada
Michael arrived a little early and was very professional. He finished the service quickly but was unable to reset the "service due" indicator on the dash.

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How Can I Prevent My Car Battery From Dying?
Your Your car battery is one of the most important parts of your car’s electrical system. Without the battery, your car simply isn’t going to work. Your battery works hard, and eventually, it’s going to wear out. So, how long...
10 Biggest Car-Related Headaches and What to Do About Them
You You don’t want to, but if you're a car owner it's inevitable that at some point you will experience car troubles. It's also fairly certain that the machine you rely on will cause you grief when you least expect...
The Top 8 Things That Will Drain Your Car Battery
Your car battery could keep dying from a variety of reasons such as age, a bad alternator, human error, and more.

Related questions

I have a 2001 Hyundai Tiburon. I can't get it started. It has gas, new starter and lights come on when I try to start it so it's n

If the starter motor is turning the engine over rapidly, at sufficient RPM, but the engine does not catch and run, that means that there is an ignition, fuel or air induction fault in the engine that will have to...

Navigation Screen is black and radio turns off every few minutes.

Hello. Unfortunately there is no reset for this. When this occurs it is because there is a short within the navigation unit. When this occurs it requires that the entire unit be replaced with a new one or a different...

Battery not charging

Hello. Several things can be causing this. Have your battery load tested. Most battery sellers do the load test for free. If it is good, then check the alternator output with a meter on the battery terminals. The meter should...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com