My son's 2005 had been having trouble starting, so replaced the starter relay. Then started stalling. Found one of the prongs on the Main relay was brown, looked like a short or something. Replaced relay and everything fine for about 3 months. Started happening again and the same prong on the new relay had similar brown appearance. What could be causing this to happen to the main relay? Short? Surge? Where do I begin looking? Any good electrical mechanics in Annapolis area?? Thanks...