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Join Date: Oct 2003
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Porsche Crest '86 944 Charging / Warning Issues

My '86 944 has an issue with its charging system: when I turn the car on (not started) all warning lights come on except the low-voltage warning light. When I start the car, the voltage gauge reads 12V, and remains there until I rev it to around 2500 RPM, at which time the meter jumps to the expected 14V (or thereabout.)

I spoke to my local mechanic, who said that the warning light is part of the circuit of the charging system, and if it burns out the system will exhibit the behavior indicated.

Tonight, I tore out my instrument panel, and found that one of the leads to the warning light had been stripped off of the circuit board and cut. I soldered the lead back together, and tested the warning light at the contacts - it worked. So I put everything back together, turned the car on, but still had no warning light, and no charging until I revved the car.

Does anybody have any ideas on this one? Why would someone cut the lead to the warning light? What should I check next? I'm not too worried about the warning light, but I'd like the system to start charging w/o having to rev it.

Thanks in advance.

Old 10-17-2003, 04:16 PM
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Join Date: Oct 2001
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Mine does exactly the same thing. Mine is confirmed by the voltmeter. Sounds normal to me. My 911 does the same thing.
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Old 10-17-2003, 06:08 PM
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Change the regulator. Get one you can adjust to 14.4 volts.

Clean all your battery connections including the grounds to the chassis and engine block.
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Old 10-17-2003, 07:11 PM
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Join Date: Apr 2002
Location: Massachusetts
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Hey, symptoms sound familiar. Just got a 924S,
the alternator does not charge at all, until you
rev it to about 4000, then it pops in and works
completely okay until you turn the car off and
have to do it again.

I checked the bulb, it is okay, and the wires
in the vicinity are okay. The blue wire to the
gauge is the one that's important I believe.
Anybody know where it goes from the instrument
cluster? I think my charging would be fixed if
I could find where it goes and how it gets to the
diode and then to +12V.

Thanks,
Mark S.
'70 914-6
'87 924S
Old 11-17-2003, 08:22 PM
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check the bulb
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87 944S, alpine white, 5sp died a violent death
84 944, silver/brown, auto, gone but not forgotten

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Old 11-17-2003, 08:25 PM
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Quote:
Originally posted by bearone2
check the bulb

Quote:
I checked the bulb
Mark S.
'70 914-6
'87 924S
Old 11-17-2003, 09:03 PM
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i used to live in marlboro and new hampshire working for digital equipment, don't know if they're still in business.

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87 951, K27/6, Almond Beige, 17" Turbotwist
87 944S, alpine white, 5sp died a violent death
84 944, silver/brown, auto, gone but not forgotten

"may the force be with you"
Old 11-17-2003, 09:18 PM
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