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If the multi-function switch and the hazard switch are not the problem (and they most likely are not), it is probably the ignition switch module that is failing. When they go bad, they fail to provide the correct voltage for a multitude of things which causes intermittent faults including no turn signals, alternator light, seat belt light, brake light randomly flashing on and off as well as the fuel gauge thinking it was a windshield wiper.
I had the same thing happen to me. First the turn signals would intermittently fail to flash, but the 4-ways would work. Then the right rear would intermittently fail to flash. Then the dash lights would randomly flash on and off. The ignition switch is about $50 and an easy fix for a maddening problem.
Last edited by AZ04IMPALA; 2 Weeks Ago at 12:31 PM.