Pulling my hair out on this, did a lot of searching and cant find anything that's worked so far. So I am looking for any ideas.
I have a 75 Ramcharger with a 440, MSD ignition, Mopar per VR. Most of the engine bay wiring has been replaced, interior wiring is mostly stock but in good shape. I recently installed electric fuel pump with relay and tuff stuff 100 amp alt. Now I have a voltage fluctuation that you can hear in new pump and see in all lights and volt meter, Its is worse at idle but there at all rpm's.
Things I've tried:
Checked all grounds and connections.
Tried Three diff VR, using mopar per now.
Disconnected fuel pump, still fluctuates.
Moved the field sensing wire from 12v ignition to battery distribution junction and the voltage is steady as a rock at 14 volts, of course this will drain the battery if left there.
Anybody have any idea what to look at next? Alt? Ign switch?
Thanks for any help.