My right side blinker is super, super, slow. Front and rear. Left side is fine. All new 1157 bulbs. I've tried several new flashers. Grounds were brushed and sprayed with contact cleaner No difference.
Anyone have this problem?
Difference in speed reflects a difference in resistance in the circuit. The slower flashing circuit has the greater resistance. If it isn't the grounds then your wiring is itself suspect. It could be a bad connector with a corroded surface, or a bad crimp, or wires that have begun to turn green with corrosion.
I suspect it could be wire corrosion. The wires are original. I had the problem with a VW ages ago. A new wire solved the problem.
I destroyed the turn signal switch tying to remove it. The Chevy manual shows a slide hammer tool that removes the T S collar and T S as a unit. Oh well.
I just installed a new super duty battery and everything is working! T S lights flash like a guy on LSD.
I do think some new wiring is in order down the road. I've been looking at the updated gauge,tach,and speedo, clusters on eBay. Very expensive however.