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I had the same problem last week. Alt not charging and alt light not coming up. This is what I did: I got a multimeter and a schematic of my charging system and tested the battery voltage with the engine off, on and at more or less 2000 RPM, same flat 12V every time. I checked to see if there was continuity from the alt to the battery, no continuity. I then checked every circuit to make sure that it wasn't some loose wire or a faulty bulb. I was told that if the bulb is shot the alt won't charge. Beats me why, but I checked it anyways. All my wiring checked out okay. So I ordered a new alternator online and it's on its way. I really made sure that it was the alternator that was faulty before ordering one.
I had charging problems a month before and it turned out to be the regulator. I'd check that too as it's cheaper and easier to install.
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[/SIGPIC]~cirrusman
1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"
[SIGPIC]
1983 Toyota Tercel (Tommy, The little Toyota that could)
1965 Ford F100 (Grandma Ford)
2005 Toyota Sienna (Elsa, Wife's ride)
Gone:
1988 Toyota Pickup
2004 Subaru Outback
1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P. 
1987 Pontiac Fiero GT
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