Too bad you don't have a known working Motorola alternator or regulator. Did you check the light function? That is, disconnect the light wire and ground it there by the alternator - the light comes on? If so then you most likely do have a bad alternator/regulator. Did you load up the electrical system with fans on, etc.? It is hard to say what might be bad since I believe (I can't find my motorola literature) the motorola is internally energized and the light function is a "triggered" function that is activated separately by the regulator. Therefore the alternator will work even if the light bulb is bad, gone, etc. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle@xxxx> wrote: > Rich and I were working on an alternator issue today that I've never > run into. I know how to look for the usual stuff, but this one has me > stumped. > > Start car - alternator light stays on, charging system at 12.1 volts > (DVM, not the dash gauge. Dash gauge looks to be about 9 volts). > > Rev Engine - charging system jumps to 13.9 volts, light stays on. > > Let it idle back down, stays at 13.9, light stays on. (Dash just > above the 13). > > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/