Question about Jeep Grand Cherokee

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My '93 grand cherokee 6cyl 4.0 would not start. It will start when i boost the battery. i have a brand new battery. i removed the battery and tested it and i got 12 volts at the battery terminals. When it is running i read about 12 volts on the car battery gauge. I disconnected the cables to the battery and it stays on runnining. I also got 14 volts at the alternator terminals. I''ve noticed that when i turned of the engine and try to restart the jeep, the battery status guage pointer will stay inside the red hash of low voltage reading, There is where i think the problem is. What is restricting voltage?.

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  • Jeep Master
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Find the blown fuse or bad ASD relay - that'll get it going. Outside chance you might have a wiring problem, ground or something, but the PCM turns that ASD relay on, which supplies the injectors and the alternator field with power.

If you have 12 volts at the battery and only 7 volts at the relay socket, you've got voltage drop problems between the positive side of the battery and the relay socket. Try temporarily running a new wire to the common relay terminal. If you can get get 12 volts at the relay's common terminal and if the relay is good, it should start.

Keep us updated.

Posted on Nov 10, 2010

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