Skip the auto shop - Our mechanics make house calls

Q: Car will not turn off - 1991 Jeep Grand Wagoneer

asked by on

I can’t get my jeep to turn off. It starts well and runs in perfect condition. I put in a new ignition switch, starter relay, but it still won’t turn off. I read somewhere that if you start the engine then turn the key to OFF then pull the plug on the back of the alternator the car turns off – the problem is with the alternator. Is this true? Do you have any other ideas on this?

A: Your reading heads you in the correct direc...

Your reading heads you in the correct direction! SOMETHING, perhaps the alternator, is "back-feeding" power to the ignition, injection, etc. Back-feeding is using an electrical circuit in reverse, and inappropriately. There is a short, or other electrical abnormality causing this problem. A bad ground (engine to chassis) can sometimes also cause this problem. A professional mechanic, like a certified technician from, YourMechanic, can diagnose this problem and repair and replace the problem component.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: I give my car gas, and it shuts down

Hi there. Are there any warning lights on? If there are any warning lights, this could lead us to the possible cause of your concern. However, low fuel pressure could be the cause. If there is not sufficient pressure in...

Q: Sometimes my car won't start

Hello, this happens a lot on this vehicle. This is a problem with the security system. The issue is not actually the security system but the computer CAN communication lines. These lines can have a poor connection causing the computer...

Q: How do I turn on the fog lights?

The fog lights can improve visibility in adverse driving conditions, namely rain and fog. To turn on the fog lights, rotate the fog light switch to the on position (the fog light switch is located next to the light switch,...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...