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**kwmech** · 01-20-2016, 09:44 PM

Hook up the ground wire on the side marker to the turn sig circuit for the fronts. The blue wires if I remember correctly. When the signal is activated, the lamps will wig wag. Do it on all my trucks even my 68 that didn't have side marker lamps originally. No you can't do it on the rear.

01-20-2016, 09:44 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,944	Re: 72 c20 engine compartment wiring question Hook up the ground wire on the side marker to the turn sig circuit for the fronts. The blue wires if I remember correctly. When the signal is activated, the lamps will wig wag. Do it on all my trucks even my 68 that didn't have side marker lamps originally. No you can't do it on the rear.