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Trailer wiring harness diag?
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04-04-2014, 12:46 PM
745 TurboGreasel
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Join Date: Sep 2012
Location: Freedom CA
Vehicle: 85 745, 84Suburban 96Ram
Posts: 509
It might be a relay to run the marker lights off a different power source, it can be too big a load for the headlight switch connector sometimes.
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