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Jeep Wrangler YJ
YJ General Discussion
Stumped by short to ground
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<blockquote data-quote="TRevs" data-source="post: 437818" data-attributes="member: 20654"><p>Since I got the YJ, the heater blower motor hasn’t worked. I don’t mind that much but it would be nice on a chilly day, and would increase the odds my wife will agree to ride in it. </p><p></p><p>I finally decided to try and figure it out. I have virtually no experience in automotive wiring, but like everything else I’ll try to learn. </p><p></p><p>I checked the fuse and sure enough it was popped. I replaced it and as soon as the ignition key went to ON the fuse popped again. I disconnected the battery, and used the mulitmeter to test for continuity from each of the fuse terminals to Ground. From the left terminal there was no circuit , but from the left terminal there was low resistance. I removed the heater controls and from my rudimentary understanding of the wiring diagram, found the dk green wire going to the heater on/off switch. I tested the end of that wire and also got continuity to ground. </p><p></p><p>I was feeling pretty smart at this point because I’d identified the damaged wire, so I removed all the gauges/bezels on the dash to inspect the course of the wire. </p><p></p><p>I’ve looked it over back and forth many times and can’t see any place where the external insulation or plastic loom is damaged. </p><p></p><p>Where else could the short be? Could it be inside the wire bundle itself without touching the chassis?</p><p></p><p>I don’t want to rip out the entire wiring harness and open it up unless I have to. It would seem easier to run a new wire and bypass the fault.</p></blockquote><p></p>
[QUOTE="TRevs, post: 437818, member: 20654"] Since I got the YJ, the heater blower motor hasn’t worked. I don’t mind that much but it would be nice on a chilly day, and would increase the odds my wife will agree to ride in it. I finally decided to try and figure it out. I have virtually no experience in automotive wiring, but like everything else I’ll try to learn. I checked the fuse and sure enough it was popped. I replaced it and as soon as the ignition key went to ON the fuse popped again. I disconnected the battery, and used the mulitmeter to test for continuity from each of the fuse terminals to Ground. From the left terminal there was no circuit , but from the left terminal there was low resistance. I removed the heater controls and from my rudimentary understanding of the wiring diagram, found the dk green wire going to the heater on/off switch. I tested the end of that wire and also got continuity to ground. I was feeling pretty smart at this point because I’d identified the damaged wire, so I removed all the gauges/bezels on the dash to inspect the course of the wire. I’ve looked it over back and forth many times and can’t see any place where the external insulation or plastic loom is damaged. Where else could the short be? Could it be inside the wire bundle itself without touching the chassis? I don’t want to rip out the entire wiring harness and open it up unless I have to. It would seem easier to run a new wire and bypass the fault. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Stumped by short to ground
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