| Re: [GMCnet] Alternator Warning Light [message #89072] |
Thu, 17 June 2010 23:03  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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To answer your questions: with the key in the "on" position (engine off), there's 12+ volts at the Inst/Tran fuse holder,
the other gauges are on, but the alternator light is NOT on.
With the key in Accessory, the alternator light is on, the other gauges are off, and
I read about 1.5 volts at the fuse holder.
Very strange. More investigation for sure.
thanks,
Karen
>
> That IS weird. The power to which that bulb compares the alternator output
> should come only from the Inst/Tran fuse, which is supplied from the IGN
> buss -- it should NOT receive power when in the ACC position. Do the other
> instruments also become active in the ACC position?
>
> I'd start troubleshooting by removing the Inst/Tran fuse and checking for
> voltage on the should-be-cold side in different switch positions -- you'll
> likely find that contact hot with ACC selected. Comparing your wiring with
> the wiring diagram should eventually reveal the problem. It's probably
> something changed by a PO. The steering column and its assorted wiring is
> NOT likely to be involved.
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Karen
1975 26'
San Jose, CA
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