Subaru Swap - Alternator wiring, What did you do? |
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Subaru Swap - Alternator wiring, What did you do? |
jpnovak |
Jul 25 2011, 03:26 PM
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#1
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They call me "Nanoman" Group: Members Posts: 231 Joined: 26-August 09 From: Austin TX Member No.: 10,736 Region Association: Southwest Region |
Now that the engine is running I need to finalize some of the electrical connections. Notably, the alternator is near the top of the list.
Normally a regulated alternator has 5 connections 12V to battery D+ D- Df GND The Suby alternator is internally regulated so this elminates the Df wire. I need to connect up the D+ and D- to complete the voltage comparator. It looks like the blue D+ wire goes to Pin1 and I send 12V to Pin2 on the alternator. 12V becomes the effective D- wire to complete the circuit on Pin2. Basically, the current across the dash bulb that is a result of a difference in voltage between the alternator and the battery regulates the charge. At least, that is how I understand the wiring. Any thoughts? |
BIGKAT_83 |
Jul 25 2011, 04:52 PM
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#2
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Senior Member Group: Members Posts: 1,798 Joined: 25-January 03 From: Way down south Bogart,GA Member No.: 194 Region Association: South East States |
From the subaru factory manual......
Bob |
jpnovak |
Jul 25 2011, 08:01 PM
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#3
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They call me "Nanoman" Group: Members Posts: 231 Joined: 26-August 09 From: Austin TX Member No.: 10,736 Region Association: Southwest Region |
Thanks Bob but that is a much newer alternator than the 97 that is in my car. I only have a battery post/terminal and a single 2-pin plug connector.
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Mike Bellis |
Jul 25 2011, 08:39 PM
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#4
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
Not a Subie but... On my rotary conversion I ditched the Mazda Alt in favor of a Chevy 1 wire. I did use a 175 amp Power Master but you can get a 80 chevy at your FLAPS cheap. Makes the conversion easier than using the original parts.
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strawman |
Jul 26 2011, 12:04 AM
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#5
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Senior Member Group: Members Posts: 881 Joined: 25-January 08 From: Los Osos, CA Member No.: 8,624 Region Association: Central California |
Here is a cut/paste from the 1998 Subaru Outback factory manual. Hope this helps...
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strawman |
Jul 26 2011, 12:43 AM
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#6
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Senior Member Group: Members Posts: 881 Joined: 25-January 08 From: Los Osos, CA Member No.: 8,624 Region Association: Central California |
Just walked out in my garage and looked at my wiring harness from my 1994 Suby Legacy Turbo that I've adapted to my 914 harness. I matched the wires to the wiring diagram in my Chilton manual, and confirmed them in my electronic version of the factory manual.
My connections to the alternator are as follows: 1. Large gauge white wires on ring connector (to fusible link) 2. Round black plug with three wires: a. White wire (to fusible link) b. Yellow wire (to fuse #16) c. Black/red wire (to charge indicator on dash). What year and model did you engine come from? Geoff |
jpnovak |
Jul 26 2011, 07:38 AM
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#7
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They call me "Nanoman" Group: Members Posts: 231 Joined: 26-August 09 From: Austin TX Member No.: 10,736 Region Association: Southwest Region |
Geoff,
Thank you for the listing. The engine is from a 1998 JDM GC8 Turbo (Forester). I can only find an Impreza wiring diagram. The connections are the same but the colors are very different. I only have a 2-pin connector and a lug terminal on the alternator. I think your post confirms that I connect the dash light wire directly to the alternator and the other pin directly to the battery. here is the Subaru Factory diagram I am working from. (IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-10736-1311687528.1.jpg) The connection [ALT-1] goes directly to the dash charge indicator light. It would be same as the exciter current lamp on the 914 dash light. |
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