ok, so I just got into the commonrail scene with the truck in my signature. hooked up my boat trailer and bam! no left turn signal or left brake light on the trailer only. thought it was trailer ground but nope, found a dead pin in my light hookup for the trailer (7-pin). tested it all the way up to the wire harness leading into the fuse box. a good mechanic friend told me its probably my multifunction switch because he tested the 4 turn signal wires (2 for truck 2 for trailer) and found the dead trailer signal wire all the way up to below the fuse box. yes I check ALL the fuses, both visually and with multimeter. what's every bodies thoughts?