Re: Generator question - negative current

Posted by TxGoat On 2023/11/15 19:46:55

When you turn on the lights with the engine off, the ammeter should show a discharge. (Needle swings left)

When you first start the car, at any speed above idle, the ammeter should show charge. (Needle swings right).

Your regulator appears to be corroded inside, probably from having had moisture in it. It's very likely that the vibrator points are corroded and not making electrical contact. It may be possible to get it to work again by VERY GENTLY cleaning the points with fine emery cloth. The regulator is very delicate and won't stand any rough treatment.
The external screw terminals, right next to the regulator case, are usually labeled BAT, ARM, and FLD. Yours appear to be so marked.
I'd try cleaning the points, then polarize the generator using the correct procedure, and, after charging the battery, try running the car and see what happens.