Skip the auto shop - Our mechanics make house calls

Q: Hooked up battery cables to wrong car when jumping it

asked by on

My friends car had a dead battery so she and I looked online to figure out how to connect the jumper cables. We ended up attaching the cables to the wrong car in that we attached both the pos and neg cables to the dead car's battery and attached the positive cable to the pos battery spot and the negative cable to a metal piece in the car with the working battery. It ran for about 2 minutes before we realized the mix up. Now the car with the working battery still runs but makes a clicking/vibrating noise when it is stopped and/or parked and the car is on.

You may have damaged the car you were jumping from. I have seen alternator, ECM, various relays, and fuses damaged from improper jumping. You should monitor the problem to see if it continues to get worse. If so, have a local expert inspect the clicking noise and pinpoint any appropriate repairs that should be made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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. Hooked up battery cables to wrong car when jumping it

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: My battery is low but I didn't get a jump yet

If you installed a new alternator and battery and the battery has subsequently died, there could be something wrong with the charging system. The best thing to do is fully charge the battery, start the car and then measure the...

Q: How do I jumpstart the battery?

While your car’s battery is designed to last for many years without any problem, it will eventually die. There are also other conditions that might drain your battery and leave it dead – you might leave the back cargo door...

Q: I had Throttle body replaced 2007 chevy uplander. Car reving highvand then alot of oily clear fluud started flowing from front mor

Hi there. It sounds like a lot going on, but we're here to help. If the throttle is still revving the engine very high at idle, then there may be something either stuck or a vacuum hose is loose. Listen,...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...