ELECTRICAL PROBLEM! Any electrical geniuses out there than can help me with the signals?? Fully rotisserie restored 1969 Dodge Dart 340 4-speed. Something wasn't hooked up right or possibly something is wrong at the fuse box. We had power with a test light at the firewall and the test light was flashing. All of a sudden now it's not flashing. Now we are going back from the inside of the firewall to the fuse box. Any ideas? Thanks guys!
This happened to my '68 Convertible. Turned out to be the turn signal mechanism itself. The wire for the contact for that light had melted into the nylon on the mechanism itself and stopped making contact leaving the circuit open for the flash.
I swapped in a new one and used a dab of synthetic disc brake grease to lubricate the pawls etc. That specific grease is wonderful, doesn't harm plastics or rubber, and made the new switch much smoother in operation.