Cjk your charging sysrem at the battery. The alternator should ce charging in this range. 13,6v to `4,2v. Remove and clean the negative battery connection, Whether it's a post or side terminal, remove and clean Your headlights created a deman, A loose or bad connection created the load and the alternatied to meet the demand taking out a bulb and overheating said wires. Headlights are yor second highest losd in a vehicle. All witing and connections must be tight and clean. Look closely at the battery grd. You want to find what in specific caused it. Good Luck_Ned_
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ok, a few days ago drivers side headlight went out, and a friend replaced it with one he had from some other truck. Then they both went out and two new ones were bought, still nothing... i've pulled the switch, checked all the fuses and relay's i know to check. thee plug that the switch goes to had two prongs that the plastic had melted a little not bad though. so far i've not found any burnt wires either... what else could i do?
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