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#1 |
Mechanical Animal
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02 Suburban trailer wiring issue
For those who don't know, I've got a 2002 Burb 2500 4x4 8.1L. I like it.
I've got no trailer brake lights. I do have both left and right turn signals. So everything on the trailer from the plug to the bulbs is good, the issue is in the truck. The wiring diagrams I've found say the trailer brake light signal comes off the third brake light. That is working. So the signal is getting lost somewhere between the CHMSL fuse and the 7-way plug under the bumper. I can't find a wiring diagram to show how the three signal (Left, right, brake) gets converted to two (just left and right). There's a "Trailer Brake Wiring" box (assume a relay) on this diagram of the fuse block under the dash, but what's actually there doesn't match the diagram at ALL (see pics). Additional clue, or distraction: The truck's hazards don't work either. Replaced the flasher, no help. Assume it's the switch and unrelated, but thought I'd mention it. Any suggestions? Thanks.
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Mechanical Animal
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Going over the manual, I did find a separate fuse for the hazards, "HAZ LP" in the lower right.
I'll check that one when I get home. MAYbe it uses that signal to "flash" both trailer turns at once? I dunno...
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#3 | |
Mechanical Animal
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Quote:
I know there's something in between; a relay, diode pack, something. I just don't know what I'm looking for, or where it is in the truck, to check it...
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Mechanical Animal
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Quote:
Quote:
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I did check that one, but I don't have the same fuses there that you do. My "trailer turns" are under the hood, and are good. Quote:
I'm confident that's the issue. That second thread you linked said $340 retail, and he paid $265. RockAuto has the Dorman for $111. Installation, however, may be a project. But thanks for your help, and I'll confirm when I've fixed it!
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#5 |
Mechanical Animal
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Finally got around to installing it, and yep, that was it.
The video was a huge help, but his fingers must be longer than mine. I had to take a few more things loose, that little plug on the lower right was a B!TCH to get back together. REALLY appreciate your help man, I just couldn't find that portion of the wiring diagram anywhere!
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#6 |
Mechanical Animal
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The bad spot on my old one:
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