I have 2006 GMC HD2500 and usir to haul several trailers. One is 5th wheell, two cargo trailers, and a boat trailer.. The 5th wheel uses a 7-pin connector. The other trailers use a 4-pin flat adapter to the same truck 7-pin. Ive pulled all 3 for several years with no problems. Recently I noticed the older carge trailer clearance and tail lights flicker when either turn signal is on. I then noticed the same thing on the 5th wheel. However, on the boat trailer they seem to work fine. I have checked the ground as best I could. Even wirined temporarily directly from battery to trailer body. Still flickers. Any suggestions?
asked by: Roger
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Featured Help InformationTroubleshooting 4 and 5-Way Wiring Installations