Fuse #18 in the PDC keeps popping

1998 JEEP GRAND CHEROKEE
180,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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BRDAVIS104
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Every time I turn the key to "run". It still turns over but won’t fire. It was working and driving fine up until this happened. Any suggestions to try and fix this? TIA
Dec 27, 2019 at 10:16 PM
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JACOBANDNICKOLAS
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Hi,

Fuse 18 is responsible for several relays. I attached a pic below and circled the relays that are powered by it. We have two choices. First, remove each relay and check it (I will provide a link showing how) or two, pull one relay at a time and see when removed, which relay doesn't cause the fuse to blow.

Here is the link for testing relays. Additionally, I have added a couple others you may find helpful.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find.

Joe
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Dec 27, 2019 at 10:57 PM