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Thanks for your response. The lights act the same when truck is hooked to the trailer. I've tried connecting into both the stock bumper plug as well as the auxilliary receptacle that was installed. I removed the tape where the two plug harnesses join and found no evidence of corrosion. I also cleaned the battery terminals as well as any ground wires that I was able to find. I followed the trailer wiring harness to behind the left front wheel well. It joins another harness at that point and goes God knows where. Where is the trailer harness normally get it's ground ? When I test the ground pin in the receptacle to a good chassis ground I get 4-5 ohms. If you have a Verizon cell phone and want to call me there would be no charge to either of us. My number is 716-628-5886 and am on Eastern time, 3 hours later than you. If I'm unable to locate the problem, I'll have to take it to a dealer, OUCH. Thanks again. Oh by the way, my name is John Pfennig and live near Buffalo, NY.
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