Hey guys. Dealing with my 78 ranchero here. Maybe "flicker" isnt the right word, but when the headlights/dome light/dash lights are on, they are constantly dimming and brightening back up. They never shut off, and they never get so dim they're unusable, they just look like the voltage is constantly fluctuating. engine RPM affects this absolutely none. It does it at idle, and does it identically at highway speeds. Parts store tested the battery and alternator and both are performing amazingly. (both were tested while removed from the vehicle) It always cranks nice and fast.. What are your thoughts on this guys? could the voltage regulator cause this? bad ground maybe?
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