924Board.org

[Llamaguy]

I replaced the alternator a few months back; the last week or two the light has been coming on dimmly, but almost only at night. It glows brighter when I turn on lights, brights, ac or heater. I try testing it during the day, but i can't get the light to come on, even with everything turned on. It's only putting out about 12.5V anyways, which is lower than when I first put it in.
is this regulator or diode problems?
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1987 924S Guards Red
1997 Suzuki Tl1000 Supersport

[gohim]

Could be a short in the wiring loading down the alternator, or a bad connection, or a bad battery, or a loose drive belt, or a bad alternator.

[Gram]

The voltage drops on my 924 when the belt gets loose..goes back up near 14V when I tighten it.
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'82 924 NA Euro (hers)
'98 Audi A4 TDI (ours)

[Paul]

Start by cleaning all the connections including the ones at the starter and battery. Do both the + and - connections.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[Codyboy]

i had the same problem mine turned out to be a shitty ground
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Go hard or go home

[augidog]

[Min]

check the voltage drop between the alternator body and the battery.

Min

[Ozzie]

I have a heavy guage earth cable attached from the engine to the body of the alternator.
When I found it had come off once I had the same problems you describe.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance