Amp meter fluctuation?

I've had a lot of old Mopars over the years with this issue but it never really caused any problems other than the headlights surging at idle. Although this is an older post I'll add some info to help anyone else with the "Dancing amp meter gauge" First I'll tell you the set up. I had owned my 1966 Dodge D-100 for about a year with the original 225 and 3 on the tree, it had the "Dancing/twitching amp meter" from day one. At that point I updated to a 440 with Edelbrock heads and Intake, aluminum water pump and housing, a new Ron Davis aluminum radiator and a 4 speed. I rebuilt the original starter and alternator at Gen Star in Glendale and I had told Gary about the twitchy amp meter when I dropped them off. When I picked them up he said the alt had a loose stator plate and that could cause the twitchy needle.(?It's been a while but I think that's what he said?) BTW the engine compartment had been completely stripped and repainted too. So I fire up the all new engine and Waa Laa, the same twitchy needle. Now what? I've never had any damage from this issue before right? So when I have some extra time I'll take care of it. Fast forward a year and out of no where I start getting little specs of coolant on the engine and air cleaner. Where the hell is it coming from? Several weeks later and a lot of inspecting I finally get my answer. My expensive aluminum radiator has several tiny pin holes in it. WTH? continued....



Keyword: Electrolysis, Ammeter, Electrical system, Cooling system.