[goransons]

You said you didn't have running lights anywhere, basically one wire, the right stop/turn is working, nothing else. Have you verified that there is 12v coming from the tow vehicle on those other lugs, or rather have you applied 12 volts to each terminal of the plug then verifying with a volt meter that you have 12 volts at the fixtures? The front clearance wire would come in a different place from the rear so with both out I was thinking it must be up in the tongue area or tow vehicle. Not sure but if its your 99 suburban, it may have seperate fuses for each of the trailer circuits.