Q: Reverse polarity jumped car, interior electronic don't work

asked by on

I was jumping off my girlfriends car and I accidentally reversed the polarity on her end (the receiving end), when they were connected. The horns, windshield wipers, and gauges started going crazy. Afterwards, the car wouldn't start at all even with the connections correct. Took the battery to advanced auto parts and they recharged it. Took it back and the car now starts and runs. But, the interior radio, dome light, power windows, will not shift out of park, and air conditioner do not work. I changed the 80a fuse that was blown in the engine and it did not fix it. I checked all other fuses and they are all not blown. Someone mentioned it could be a relay but I don't think it would start if that were the case. Thank you for you help.

My car has 195000 miles.
My car has an automatic transmission.

Reverse polarity, at the battery, in a 12 volt electrical system on a car can cause a variety of effects including damaging the alternator, diodes and the numerous microprocessors on a vehicle such as those in the powertrain control module (PCM). As far as other fuses, they are numerous not to mention fusible links, circuit breakers, and all of the individual electronic components themselves in many circuits that could have failed due to reverse polarity. With regard to the circuits you have mentioned, namely the radio, dome light, power windows, park shift interlock, and the air conditioner, the best thing to do is simply trace those circuits to find the fault. It could be a fusible link, device fault or damage to a microprocessor based control or solid state relay. Simple circuit tracing, for example just starting with the dome light circuit will reveal the fault. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an electrical diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Reverse polarity jumped car, interior electronic don't work

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: Rubbing sound when going over bumps even after replacing the struts.

Hi there: When struts are replaced, they typically take a while to break in; which during this time period, other mechanical problems such as worn out CV joints, ball joints, or stabilizer bar bushings can cause the issues you're describing....

Q: I went for and oil change, tire rotation, and inspection. Why would they also replaced my rear brakes and pads at 19k miles?

Hi there. From the description you have provided, going in for an oil change, tire rotation, and inspection, being told your vehicle needs rear brakes at 19,345 miles and leaving there $580.00 poorer, makes me cry too! It makes absolutely...

Q: Battery dies if the car sat for over 20 hours

Batteries that drain overnight are common. Usually when this occurs, there is a parasitic drain on one of the car's systems. When this occurs it drains the battery down over time. Batteries that are drained down repeatedly can cause them...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.