1996 Ford F-150 horn problems. The horns are OK and the relays have been switched out with known good relays. I don't have a wiring diagram and would like to know what the wire color codes are from steering column horn buttons to the fuse box and then to the horn. Is there a fuse link in the mix? I seem to remember at one point in time I had a puff of white smoke ( no electrical burning smell )came from the dash ( top and bottom right side of dash in the cab) but after inspection,everything seemed to work fine until now. Please help.