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I seem to have a problem with my elect. system somewhere that is causing all the lights inside and outside to flicker or pulsate slightly while the motor is running. I am relatively new at this classic car stuff so I am relying on someone with considerably more knowledge than myself to help. I put a volt meter on the battery and it reads 12v with motor off, the alternator is putting out the expected 13 volts. What I am not sure of is the location of the regulator, but I suspect it is built into the alt. Is this correct? Is there any other circuit that can be causing this on the light circuit? Also, it does seem to change frequency with engine rpm's. It also appears to be somewhat intermitent when I fidget with the light switch, but nothing that I can repeat with consistancy. I have noticed that is most evident when all lights (int/ext) are on (full load) while idling. I am suspecting a regulator but would like an expert opinion.