No telling how this applies to you, if at all... But when I got my 72 Cuda I had all kinds of electrical problems... dimming headlights, alternator not getting power so not charging battery.. VERY low power coming into the dash gauges etc. People kept telling me it was the voltage regulator, or the alternator... No! The main, (And easiest), fix was the fusible link in the engine compartment near the battery... it was black and partially burned under all the tape. Once that wasn't messing up all the car's electric power it was much easier to get the rest figured out. Just in case you didn't already look?