1st gen headlight issues

First post here, I have an 03 4wd reg cab base model tacoma, and the headlights will cut off after 30 minutes when you turn the switch on. Once they cut off, you can cycle the headlight switch and the lights will stay on for another 30 minutes. I have aftermarket housings that were on the truck when i bought it, but the bulbs themselves are factory halogen. I read up on several different forums and have replaced the selector switch, headlight relay, door switch, and have checked my ignition switch, all to no success in solving my problem. Throughout the forums i have read, several people have had the problem, but no one has uploaded a solution. If anyone has a wiring diagram or any help it would be appreciated, just tired of throwing parts and money at it. Thanks