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i really dont think its a pinched wired. with it being in both harnesses. my heater box had a crack in it. so i replaced it with the heater box out of the 98 tahoe. my guess would be a body control module but i cant find one. i saw on a coupe websites that they dont have a bcm.

i have a 96 tahoe. everything worked fine on it a while back. i pulled the dash out to put a heater core in it. and when i put it back together. i had a issue with the gauge cluster. and the radio. the gauge cluster when i put my left turn signal on the tach will go from idle 500 ish...