Gold Lifetime Member
Join Date: Sep 2006
Location: The Bluegrass State
Re: Puzzling issue (related to brake lights and turn signals)
Don't know if I have a direct answer for you, other than the ground issues that you mentioned - these are quite often the root of many electrical issues. However, I will say this based on past experience - check the simple, stupid stuff first before you dig in too deep. Case in point: when I first got my 67 RS/SS, I had a lot of weird issues with the parking lights, brake lights, and turn signals. If I recall correctly, hitting the turn signal would actually make the dash lights blink in time to the flasher, and other strange things were going on. I scratched my head, drove myself crazy, and went as far as digging into the wiring in the steering column trying to find the cause. After banging my head against a wall for a while, I stumbled across the problem - the previous owner had installed 1156 bulbs in the taillight sockets instead of 1157's, which was allowing the current to back-feed to the instrument lamps. Sometimes it's the simple, stupid stuff. Good luck.
1967 RS/SS 350 Conv - triple black, 4sp, tach & gauges
1969 VN-built RS/SS 396 Conv - Garnet Red/Black, 4-sp, tach & gauges