wiring problems

[Mark31]

Fellows, this is not specifically a Dodge question, but I guess some of it applies to Dodges that don't have the factory tow wiring. I do know that there are some real smarties that hang around here. (Smart enough to buy a Cummins!!!) I am hoping one of you electric gurus can/will give me some help: I have an 88 GMC S-15 (my daily beater) that for years the dash around the headlight switch and especially the heat a/c control gets too hot. Today it got my attention. If I run the fan on the 3rd or 4th speed with the a/c, I have smelled hot wiring. I changed the scorched-smelling a/c control several years ago. All the grounds I can find have been cleaned. I carried mail in this truck from 88 to 97 (when I got a right-hand-drive Cherokee). It has 240k on it and I guess 9500 hours. Summers are long, hot, and humid here in northeast SC and all the years of heat I know have taken its toll on the wiring. 1. Maybe a couple of years ago, I saw an extremely thorough and neat article on wiring trailer lights so the load would not have to go through the headlight switch. Even though my trailer has LEDs, should I do this? Anyone remember this link? 2. Should I add a headlight relay kit (meant mainly for high power lights)? 3. Should I leave everything electric off untill I can "take out a second mortgage" and get a new wiring harness? Or just park it until then? Just replaced the alternator (bad bearing) What is causing the heat? Any help would be greatly appreciated!! Mark