1999 Jeep Grand Cherokee Short Circuit

USADCH

MEMBER
1999 JEEP GRAND CHEROKEE
4.7L
V8
4WD
AUTOMATIC
166,445 MILES

Having Short Circuit in Engine fuse Number F 15 (50 A) of Grand Cherokee 1999 V-8. I don't know what function is working with the fuse f 15 (50 A) that is short circuit taking Earth. My Car starts in the morning Very Easily but After 15 mintes switch off the engine then again not started the wires of positive side is gone hot when gone cold then I can start

Friday, August 29th, 2014 AT 12:59 AM

1 Reply

CARADIODOC

MECHANIC
34,330 POSTS

I don't understand your last sentence, but a simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

You might look at the oxygen sensor wires to see if a harness fell down onto hot exhaust system parts and a wire is touching something metal.

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Friday, August 29th, 2014 AT 1:06 AM