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We will get his trailer lights all figured out this week. Seems there are a few minor harness connections that need some TLC and then we can attack the "what wire does what" to get his new civy 7 wire plug going.

Try this, I may of screwed up my wiring info in the Civy to Mil thread: 22-460 Right Turn Black with red tracer 22-461 Left Turn Red with white tracer 21 Marker Lites Red 90 Ground Black with red and white tracers Report back. I bet this will fix it.

On your TRUCK, do you have a flat blade 7 wire, or a 6 pin round wire connection??

Check your PM's. Give me a call if you want.

Yes, under the trailer. Match the tags tag to tag. Make sure they are tight.

Check all the wire bands where the thick cable connects to the body hareness. Make sure all the #'s match.

http://www.ltw.net/Hummer/074424.pdf PDF page 196, TM page 5-4 Thats the diagram you need. Where exactly did you make the cut? I think I know what you did, but need to confirm. Did you hack off the 12 pin plug leaving the thick cable?

Cutting the harness was a bad idea, as all the wires are tagged with metal marker bands as to what they are. time to break out the multimeter and start tracing wires. Where exactly did you cut the harness? take a pic and post it, all hope may not be lost. There are only 4 wires you need...

Welcome to the fun world of electrical gremlin troubleshooting..