Here is a weird one for ya. I am about to buy a 93 Silverado extended cab 2wd tomorrow. i am getting it for a price where i hope i can not loose any money on it if i cant fix the problem. The owner tells me that everything works great until you turn on the headlights. When you turn on the headlights all interior power is lost and the turn signals dont work. he said gauges quit, turn signals quit, even the power windows quit. I am guessing this is a bad ground or 2 wires rubbing together mabye. Just thought i would throw this out there and see if anyone has had the same experience and mabye cut down my troubleshooting time Thanks for the help, look forward to seeing if anyone can diagnose this before i go to look at the truck. oh yeah, i also forgot about the blower motor. it does not work at all. i am assuming bad motor, switch, resistors or wiring. what is the most common failure on the blower motor system? I dont think the blower motor problem is related to the other electrical issues but i have seen weirder things happen!! Thanks Again!!!!