"I am still trying to figure out why GM would install a thermal breaker inside the dashboard switch when there are spare fuse positions in both of the fuse panels in this truck."
One guess is that GM considers headlights very important. A circuit breaker will reset itself to keep you going. Circuit breakers take more room than fuses. Perhaps there wasn't the room for a breaker. Yea right.
Then of course there's the cynical reason of "New Improved" which usually translates to mean, "New Improved Profits". Replacing a switch makes the dealer and GM more money than simply replacing a fuse or circuit breaker.
If the switch is usally the problem, then it's an OK design as it is often costly and frustrating to trace why a fuse has blown or a breaker opened.
Another posibility is that the thermal breaker is right in the switch in case the switch overheats and would otherwise risk starting a fire.
We think it's the control module.....even though I took it to the shop and tested the crap out of it and was fine we still think it's bad..I just have to buy one and find out. Just sucks once you install it you own it.
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