Hmmm...the GM alternator that I installed has two seperate wires. One for the light and one for the sense. It was an easy splice since I had an old Ducy in there. My alternator is a 105amp unit from a chevy cavalier. Steve --- In dmcnews@xxxx, dherv10@xxxx wrote: <SNIP> > The Ducellier had the light wire as well, but being a two wire system, the > sense voltage also came through the brown wire. > John hervey