Blinker problems
 

When turning on signal light switch, either way both front signals blink at the same time. Rears work fine. New Kwik wire harness. This is on a 63 Lemans.

When turning on the signal light switch and both front signals blink together while the rears work fine, it often points to a grounding or wiring issue in the front circuit, especially with a new Kwik Wire harness installed. Double-checking the front grounds and connections can usually solve this, much like troubleshooting details in fc mobile mod setups where small wiring errors cause big effects.