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911 user
Join Date: Sep 2001
Location: East of Eden, West of the Sun
Posts: 2,411
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Alt alternator lights up when I place in reverse gear
It's an 89 model 3.2. In daily use. Alternator was replaced about 15k miles ago.
Place in reverse gear and the alternator light comes on! I'll take it to an autoelectrian but I'm dumbfounded on what it could be. Any clues?
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Where once the giants walked now Mickey Mouse is king. My other car is also a Porsche. |
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02-07-2007, 11:23 PM
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Registered
Join Date: Mar 2004
Location: New Jersey
Posts: 1,861
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How about a shorted wire or a bad backup light switch.
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Peace, Ron www.ronorlando.net 78SC Targa 3.2 SS, 964 cams, CIS, SSI's,Dansk Own a gun and you can rob a bank , own a bank and you can rob the world. |
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02-08-2007, 02:48 AM
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Registered
Join Date: Sep 2006
Posts: 198
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I just researched this on my '85. The ALT light connects between alt and ignition switch via a diode. So the light goes on when alt is below battery by 0.6V during operation.
The connection to alt is via 3 diodes to the coils. So it's monitoring the AC output inside the alt, not the alt output. I could see this in schematic. This does not answer your question but may help in testing the voltages on each wire. |
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02-08-2007, 12:55 PM
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