Today, a friend gave me two Model T generators to repair. Well, they are both rather tired, so I thought I attempt to make one serviceable unit from both. One armature was badly worn where the drive gear fits, which make this one unusable. The other armature has a straight and within tolerance shaft. Tested the armature on a growler. No shorts, opens and each winding generators a strong voltage. Apparently at one time, someone replaced the insulators on the brush rigging and it is still in good shape. Also the brushes are like new. So I optimistic thought I could make one work. After assembling the better pieces, I found the generator would motor at 4.0 amperes and the field current was around 1.5 amperes. Looks good. Then I set the neutral, which seemed a little squirrely, so I moved on. The generator would not generate. Pulled it apart and looked over as much as I could, re tested the armature, looked at the field windings, all looked good. Did this a couple of times before I noticed the problem. I had replaced the 4 6x32 machine screws that hold the neutral setting ring. The replacement screws I got at the hardware store were 3/8" long, which is about 1/8" longer than the originals. Doesn't seem that important, but one of the screws was barely touching the commutator and shorted it out. I shortened all 4 screws, reinstalled everything and just like magic, the generator came to life and began producing current. Just thought I mention this for anyone else who may replace hardware. Make sure it fits properly. Mike
Thanks Mike. May come in handy someday.