| Re: [GMCnet] Alternator Warning Light [message #89072] |
Thu, 17 June 2010 23:03  |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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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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| Re: [GMCnet] Alternator Warning Light [message #89085 is a reply to message #89072] |
Fri, 18 June 2010 06:17  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Karen,
Since that bulb compares the voltage at the fuse to that at terminal 1 of
the alternator (the brown wire in the plug), I'd next check that voltage
with the ignition switch in Aux and Ign.
The 1.5 VDC at the fuse with Ign off is curious. I'd put a load (test
light) on there and check the voltage to determine whether it's a high
impedance load causing the voltage to appear.
Ken H.
On Fri, Jun 18, 2010 at 12:03 AM, KB <kab7@sonic.net> wrote:
> 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.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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