| Have to be careful here , the mechanical regulator and one wire alternator work by supplying power TO the field . A ground on that wire will either burn wires or blow up regulator . An open wire = no charge There is a fine wire inside regulator that burns open if F is accidentally grounded ( can be fixed ) . So a ground cannot do what is described . That fine wire inside is a fuse of sorts . Occasional wavering ammeters are absolutely normal up to a point on this design . It wavers as there are only three positions , closed ( full charge ) resting between the two points ( about half charge, adds in a resistor ) and touching grounded lower point ( no charge , but trickle comes out ) It jumps around very fast averaging these. , as needed unless battery full or empty . That action makes it waver . Nothing is wrong with gauge for sure . Can’t fail in that manner If however anyone messes with it ( the golden screwdriver ) they WILL screw all ‘this up , it is not just arm position , —spring load , point gap etc —it is dependent totally on the space between magnet pole and arm in all three positions . You bend or adjust anything you wreck it . If you cause both points to touch at once by messing with it , that is a dead short on ignition . I have seen that . I have seen in and out wires swapped ( why they are different ends) But people break off wires messing with VR constantly taking it on and off . I even had a car where mount screws were stripped in the firewall . Arrgh That said , there is a factory contact clamp adjustment screw I have seen get loose and whole contact assembly moves . Be sure it is tight . Usually you can see where it was . Any issues like this one are best solved with a new mechanical regulator, NOT a solid state chinese replacement . They fail in a month . The Other two wire field alternator applies12 v ignition power ( blue?) to one terminal , then it grounds other ( green?) wire (F) for full charge . That was done to use an NPN transistor to ground , to control it, in “ silver box” mopar electronic regulator with a plug on it . Green wire is F blue is 12 v ignition power in to run its own electronics . You can use 2 wire on our cars by grounding one F and using other to apply power from electronic regulator , like the one wire was . You can convert to two wire and electronic regulator too , too long for here , see late 70’s dodge truck manuals Last the mechanical one we have can develop an open rusty resistor in the back of it . That resistor is what gives the middle position . If burned or rusted it will constantly jump from full on to full off , again a new VR needed . Rock auto had them cheap last year . Hood this helps ! Wildly Dancing ammeter = alternator brushes ( check ) or golden screwdriver has been in regulator , or rusty / burned resistor . My money is on golden screwdriver in the past , or misread of normal behavior . Good luck , John Sent from my iPhone On Dec 31, 2022, at 12:03 PM, dplotkin@xxxxxxxxxxxxxxxxxxx wrote:
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