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Registered
Join Date: May 2018
Location: New Orleans area
Posts: 18
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3.2 Not Charging!
3.2 Not Charging! Pulled engine and got tranny rebuilt. Put it back together and the alternator isn't charging. Pulled the alternator and it checked out great, 92 amps, makes sense since it's only 2 years old. One clue, the battery light doesn't come on when the ignition is turned on. Prior to pulling the engine, alternator charged great. Just put in a new battery and that isn't it. Little blue wire on the back of the alternator has power when the ignition is on. Wires at the starter are snugged down. Any ideas?
Bob '86 Cab '75 Targa, 3.0 |
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09-26-2018, 01:20 PM
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Cars and Cappuccino
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Voltage regulator? Kind of fiddley to get at with the engine in, not not horrible.
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http://www.carsandcappuccino.com 1987 Grand Prix White "Outlaw" Turbo Coupe w/go-fast bits 1985 Prussian Blau M491 Targa 1977 Mexico Blue back-dated,flared,3.2,sunroof-delete Coupe 1972 Black 911 T Coupe to first factory Turbo (R5 chassis) tribute car (someday) |
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09-26-2018, 06:46 PM
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Registered
Join Date: May 2008
Location: Grapevine, TX
Posts: 1,110
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if you disconnect the blue wire from the alternator and ground it, does the charge light illuminate? If yes then it points towards the regulator of the alternator. If the charge light still doesn't come on, the there is an issue with the blue wire supply of 12V to the alternator. Test with the key in the run position.
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09-26-2018, 07:49 PM
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Member 911 Anonymous
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+1 ^^^
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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09-26-2018, 08:37 PM
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Registered
Join Date: May 2018
Location: New Orleans area
Posts: 18
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3.2 Not Charging
Solved: When putting the alternator back in, I wrapped some electrical tape on the negative wire connection and accidently bumped on the little wire on the alternator with the clear plastic cap - it looked connected but wasn't. It's tight in there on a Cab with the extra shock right by the fan. Connected the wire and the battery light came on! put it all back together and it's charging 14.5 at speed. But that doesn't explain the original problem - was charging when I took the engine out for the tranny rebuild, waited three months, put engine and tranny back in, didn't charge. However, I added a new battery at the same time, the big 49 that barely fits. When it didn't charge, I cleaned every ground and ground wire on the car - all were nice and shiny except the main ground by the battery, it was not. I figure in wrestling the new battery in, I moved big ground and what was making contact before got shifted, since it was a bit crusty. So I cleaned it off, still not charging until I reconnected that little wire on the alternator. So now it's charging and every ground is clean, should be good for a while. thanks for the help!
Bob '86 Cab, SSIs, Monty, Steve Wong chip, aluminum pressure plate '75 911S Targa, newly rebuilt 3.0, 10.5 compression, 964 cams, Franken CIS, SSIs, Monty - needs Carbs and S cams! |
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09-27-2018, 08:11 AM
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Member 911 Anonymous
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:-)
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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09-27-2018, 03:34 PM
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Marble Grey
