Nell -
One other thing I ought to mention... instead of a standard three-prong plug on the back of the headlamp, there are three individual wires... which I pulled without noting which went where. When I plugged the wires into the new bulb, it seemed to make light no matter where they were, but only works the way its supposed to when wired correctly.
Someone here probably the correct wiring written down... wind chill is below 0F outside and my garage is COLD, so I'm gonna pass on taking a look at it this evening. If you don't have a 7" headlight in it already, you'll have to obtain a new ring. Readily available from CMW, Hitchcock's and others.
Mike and Stumpy in Michigan