2004 silverado 4x4 dually with dump box salter for plowing.Having trouble with rear running klight for dumpbox. have changed cicuit board at main harness that splits to left and right rear lamp assemblys. Cabn only get left brake & signal & backup to work nothing on rightside or running lights. Any ideas or help would be great..
Have you checked the fuse, changed the relay, checked to see if theres power at the light and power coming off circuit board with a test light? Maybe theres a short in between.
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