I have a 70's 400 in my 69 firebird, more recently I noticed when running that the lights are pulsing. I tested the Alternator and it is good, my guess now is that the voltage regulator is slowly dying. I plan on replacing it but was wondering if anyone else had any other suggestions of what could cause this issue. I also thought it could be an internal ground in the dash assembly as the car does not have the stock radio (just a vacant space now) and if I have the hazard lights on and press the brakes at the same time the hazards don't flash they just stay on. Any help and suggestions would be greatly appreciated