Remember, he's not going to have any more experience or knowledge on this than you, but he's going to charge you. (no disrespect to Sam, if I needed any work done, I'd take it to him). Just stick it out and keep plugging along. Figure out what wire should be getting current but doesn't, then back track that wire to the battery and look for any open spots (plugs, relays, switches, etc). You can do it, just think logically.