ok here i am i have been fighting with this all day. Put LT blinker on works as advertised put RT blinker on RT front blinks but both tail lights flash. HAZ work as advertised as well as parking lights. removed RT rear bulb same problem, new flasher same problem. Disconnected wire harness from blinker switch and crossed RT and LT and got the problem to swap. With LT blinker on and hit the brakes blinker still blinks brake lights come on. Turn RT blinker on both tail lights flashing and hit the brakes they stop flashing and brake lights come on. It is a 72 blazer. I am leaning towards the signal assembely.