PrecisionTT

Same problem I'm having. Thank you for your help. I'll post if I find anything

I checked the ground, and ran a separate ground wire from the tail light housing to the from. It helped a little but still flashing opposite side very faint but still flashing. Someone mentioned maybe it was back feeding to the turnsignal switch, is this possible? Thank you for your help.

I've traced the problem to the back. I've changed all the bulbs thinking one may be bad, but the problem continues.

I'm sorry I forgot to say, yes it's for a 74 620

Turn signals work fine till I turn the parking lights on. When I turn the parking lights on the turn signals will flash and so will the opposite side. The side makers also flash but very faint. Has anyone come across this problem?