Driving my car around at dusk, I've turned on the headlights and the ammeter goes from about +10amp to -5amp. I can rev the engine but it doesn't go positive so I'm assuming I'm draining battery. Is there an adjustment I should make so that this doesn't happen or something in the generator I should check?

Where Are You From? Texas

Do You own a car built by Durant? '28 D65 coupe

Paul,

Most if not all of our old cars have whats called a third brush in the generator, you can loosen a screw and advance the brush(one way or the other) to regulate your voltage...The third brush is pictured in most of our wiring diagrams in the tech page.
Bill

Where Are You From? Yuma, AZ / Leavenworth, WA

Do You own a car built by Durant? '23 A-22 touring / 29 M40 Coupe

Thanks, I did adjust the third brush and this did the trick!

Where Are You From? TX

Do You own a car built by Durant? '28 D65