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Alternator not charging after replacement
I replaced the alternator in my 89 3.2 Carrera after the warning light came on at idle, going out at full throttle and testing a no charge condition at the battery.
Now after going through this fun (!) job of taking everything apart and installing a rebuilt unit from Pelican, I started the car and the same condition exists! Warning light on (at any engine speed). Tested no charge at battery! All cable connections looked fine. No obvious broken wires at alternator. The regulator is part of the alternator, so???? What am I forgetting as a possible cause? At least the cleaned up fan assembly looks great! Any advice would be appreciated! Mike
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VOPO '74 2.0 Last edited by Mike Kunz; 11-10-2008 at 02:05 PM.. |
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11-09-2008, 06:01 PM
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Soldier of Fortune
Join Date: Aug 2008
Posts: 987
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I could be wrong (usually am), but isn't there a separate rectifier/circuit outside of the unit? I believe the regulator is internal, but I remember reading somewhere there was another "gizmo" in the circuit...?
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11-09-2008, 06:03 PM
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Soldier of Fortune
Join Date: Aug 2008
Posts: 987
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A bump for you. I'm curious as to the (correct) answer, also.
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11-10-2008, 12:30 PM
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Thanks...I'm surprised no one has chimed in, so thanks!
Does anyone have a reference for a wiring diagram for an 89 3.2? I noticed that the diagrams on line here only go to a certain year. Mike
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VOPO '74 2.0 |
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11-10-2008, 02:04 PM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,469
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check the 14 pin connector on the engine relay board for any corrosion. big red to B+, brown grounds to D-, blue to D+/61. pretty simple. if that's what you have, get another unit.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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11-10-2008, 02:51 PM
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Are you sure you hooked it up correctly? When I installed my repaired alt, I connected the wires to the wrong connector post. I drove the car to work the next day. No problem in the morning but didn't have enought juice to get back home. The car conked out at about 8-9 volts; watched the voltmeter go down from 13V or so. Had to wait 2 hours for AAA tow to show up.
I've had the car towed a couple of times over the years; love their expression when I tell them to take it back to my place instead of a shop. jt -84 targa |
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11-10-2008, 07:49 PM
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diode at alternator light
i think the diode is at the alternator light...
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1975 911S Targa Silver Anniversary Edition |
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11-10-2008, 07:58 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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Returning a new rebuilt alt is not unusual. Starters a little less likely. I take it as just part of the job.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-10-2008, 08:28 PM
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Bring the alternator into Pep Girls or the Manual Zone, and have them test it. Could be a bad rebuild.
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11-10-2008, 08:47 PM
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Join Date: Jul 2005
Location: DC midatlantic / LA SoCal
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Make certain you attached the ground strap to case,it will not charge without it!
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GT2 RS 3.2 RSCS 3.8 R 2.5 Twin Plug |
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11-11-2008, 08:19 PM
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Join Date: Nov 2002
Location: Los Angeles
Posts: 2,571
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John nailed it. If everything checks out get rid of that alternator and get a NEW BOSCH unit.
There's been a bad run of rebuilt alternators surfacing lately... (this has nothing to do with the vendor and everything to do with the supplier) |
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11-11-2008, 08:54 PM
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I'm with Bill
Join Date: Jun 2005
Location: Scottsville Va
Posts: 24,186
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I have had 2 bad alts in the last 6 months, both from diff. vendors, both reman Bosch units.
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Electrical problems on a pick-up will do that to a guy- 1990C4S |
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11-12-2008, 02:48 PM
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1974 Porsche 914-4 2.0
