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Jeep Wrangler YJ
YJ General Discussion
Need advice on a Jeep
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<blockquote data-quote="machoheadgames" data-source="post: 441159" data-attributes="member: 18789"><p>I have seen a few fires occur in the 11 years I’ve been in the YJ world (fb posts, forums, etc), I still don’t exactly know why it happens. I do know sometimes people have wires pull out of their slots in the PDC. Not sure why on that either, maybe the retaining tabs weren’t bent out enough from the factory, or maybe they broke from years of use which then frees the wire to pull right out. </p><p></p><p>I do know the alternator charge cable that provides voltage to the PDC and subsequently charge voltage to the battery (+) terminal, splits into 2 10 gauge cables as it enters the PDC. Don’t know why Jeep did it that way, because it starts at the alternator as 6 gauge single cable. For whatever they split it into 2 and ran each through a fuse at the PDC that connect to a buss bar on the other side of the fuses. So the cable is essentially a Y.</p><p></p><p>My theory used to be that one of the 2 10 gauge legs pulls out of the PDC, because I know that sometimes happens with the PDC and these types of cables in general. However, say one leg did pull out and shorted to ground, while yes you would be able to short the battery to ground through the other leg, the fuse that leg is connected to should pop……</p><p></p><p>So I don’t know what the actual problem is. The PDC doesn’t have any large ground cables going through it. Maybe a relay ground comes loose and touches the buss bar. I really don’t know.</p><p></p><p>I do know you can buy a firewall harness from eBay which will have the PDC and firewall fuse panel bulkhead connector and replace in order to replace the harness if needed. My guess is the ones that catch on fire are a victim of neglect, but since it’s hard to find where the fire starts once everything’s burned, it’s truly hard to say.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 441159, member: 18789"] I have seen a few fires occur in the 11 years I’ve been in the YJ world (fb posts, forums, etc), I still don’t exactly know why it happens. I do know sometimes people have wires pull out of their slots in the PDC. Not sure why on that either, maybe the retaining tabs weren’t bent out enough from the factory, or maybe they broke from years of use which then frees the wire to pull right out. I do know the alternator charge cable that provides voltage to the PDC and subsequently charge voltage to the battery (+) terminal, splits into 2 10 gauge cables as it enters the PDC. Don’t know why Jeep did it that way, because it starts at the alternator as 6 gauge single cable. For whatever they split it into 2 and ran each through a fuse at the PDC that connect to a buss bar on the other side of the fuses. So the cable is essentially a Y. My theory used to be that one of the 2 10 gauge legs pulls out of the PDC, because I know that sometimes happens with the PDC and these types of cables in general. However, say one leg did pull out and shorted to ground, while yes you would be able to short the battery to ground through the other leg, the fuse that leg is connected to should pop…… So I don’t know what the actual problem is. The PDC doesn’t have any large ground cables going through it. Maybe a relay ground comes loose and touches the buss bar. I really don’t know. I do know you can buy a firewall harness from eBay which will have the PDC and firewall fuse panel bulkhead connector and replace in order to replace the harness if needed. My guess is the ones that catch on fire are a victim of neglect, but since it’s hard to find where the fire starts once everything’s burned, it’s truly hard to say. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Need advice on a Jeep
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