Q: When to disconnect the battery during repair

asked by on

What kind of work requires the battery to be disconnected? Does replacing fuses require it?

No replacing fuses isn’t required. If you want to do any kind of serious electric work, it could be required because you don’t want to short out the power to your wiring system and have it go back to the computer and fry the computer. Say you’re going to change the alternator, first take one of the battery terminals off. Then you can’t short anything up. Say you’re working under the dash - I’ve seen more guys replacing the radio on their cars and then short something out and ruin the computer of the car. Anytime that you mess with electricity, it’s good to unplug a terminal and then do your work. But you don’t have to do it for just a fuse. The fuses are safety devices themselves anyway. If you want to have a fuse replacement done for you, a certified technician from YourMechanic can come to your location to perform the task.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. When to disconnect the battery during repair

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car suffering a loss in power

If the issue seems to be in time with the crank pulley, then it may be a timing issue. This engine tends to have a history of misfire issues, typically from bad coils. I typically start by scanning the computer...

Q: ECM fuse keeps blowing

Hi there. If the ECM fuse keeps blowing, then there is a definite electrical short. Most of the time the short is in the ECM, but it may have a short in the wiring going to it. I usually isolate...

Q: Car won't go over 2rpm or 15mph after it died. Have a clue what it is?

It is possible that your battery is just too weak at this point to handle the extra power that higher RPMs demand. More power is required for the fuel injectors and ignition components. Try charging the vehicle for a long...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.