[Wayne 962]

Well, the alternator does have a voltage regulator and such. I think this has something to do with the headlamp motor having four wires to it - presumably for the field coil winding and the armature winding. It's been about 30 years since I've studied this stuff, so I don't quite remember. A three minute Google search didn't reveal anything useful either. I have a lot of other things to worry about, so I will just plug it back in as-is (since it works), and leave it alone. Unless someone else here knows and wishes to explain...

-Wayne