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Old 12-08-2008, 11:17 PM   #1
mpaone
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Join Date: Jun 1999
Chapter/Region: South East
Location: Alfretter Geeoja
Vehicle:
2012 Geeteeeye
and 71' VW Gulf Beetle

Question using an 04 STi alternator on an EJ20G?

Since I'm an electrical newb can anyone assist me in using the new alternator I purchased on my EJ20g?

As with most Subies the dimensions are identical but the MY04 alt. has a 3 wire plug whereas my car has a 2 wire plug.

TIA,
-Mike.

EDIT:I know I can buy a used one that fits but got a deal on a brand new one so I want to make it work (even if it means sourcing the correct connector used) Just need to know how the wiring can be adapted to work.
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Last edited by mpaone; 12-08-2008 at 11:23 PM.
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Old 12-09-2008, 02:48 AM   #2
94 GT
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Iran into the sme problem when swapping a early 90's ej20g into my 94 ej22t legacy. so I used the legacy's one (evin though the jap one was better) cause that harness has an extra wire in it! maybe it's not nessary but I did'nt want to mess around!! maybe the american comps need an extra hot to let know it is operating?????/ so find out were the extra one goe's!!

going to see my alternator, starter guy tomorrow! so maybe he can answer that one!
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Old 12-09-2008, 09:11 AM   #3
mpaone
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2012 Geeteeeye
and 71' VW Gulf Beetle

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Quote:
Originally Posted by 94 GT View Post
Iran into the sme problem when swapping a early 90's ej20g into my 94 ej22t legacy. so I used the legacy's one (evin though the jap one was better) cause that harness has an extra wire in it! maybe it's not nessary but I did'nt want to mess around!! maybe the american comps need an extra hot to let know it is operating?????/ so find out were the extra one goe's!!

going to see my alternator, starter guy tomorrow! so maybe he can answer that one!
Cool thanks.

The label on my old one shows what looks like the plug and the letters S L (left to right with the clip on top), where the new one show S L C. I assume that means L is ground, S is power but gotta figure out what C is.

-Mike.
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Old 12-09-2008, 12:48 PM   #4
kingsubi
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04 sti alternator:
1.Blue goes to ECU
2.Blue/red goes to main fuses
3.Black/white goes to cluster

2-wire alternator:
1.Black/red goes to cluster
2.White goes to main fuse box

edit: I am guessing you don't have the pigtail..

Sti 3-wire is 1 2 3 with tab at top, 2-wire is 1 2 with tab on top
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Old 12-09-2008, 01:18 PM   #5
mpaone
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Quote:
Originally Posted by kingsubi View Post
04 sti alternator:
1.Blue goes to ECU
2.Blue/red goes to main fuses
3.Black/white goes to cluster

2-wire alternator:
1.Black/red goes to cluster
2.White goes to main fuse box

edit: I am guessing you don't have the pigtail..

Sti 3-wire is 1 2 3 with tab at top, 2-wire is 1 2 with tab on top
Thanks! Actually trying to buy the pigtail used as we speak so it will look cleaner. I assume since the stock one does not need an ECU out I can just wire it into the fuse box? So with the pigtail, blue and blue/red to fuses and black white to cluster.

-Mike.
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Old 12-09-2008, 03:58 PM   #6
Arctic Assassian
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04 WRB/carbon fibre STI

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Don't put the blue wire to the fuse box, leave it open.
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Old 12-09-2008, 04:37 PM   #7
mpaone
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2012 Geeteeeye
and 71' VW Gulf Beetle

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Quote:
Originally Posted by Arctic Assassian View Post
Don't put the blue wire to the fuse box, leave it open.
Ah, OK thanks. Prob a switch.

-Mike.
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Old 12-10-2008, 09:22 AM   #8
mpaone
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Join Date: Jun 1999
Chapter/Region: South East
Location: Alfretter Geeoja
Vehicle:
2012 Geeteeeye
and 71' VW Gulf Beetle

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Quote:
Originally Posted by kingsubi View Post
04 sti alternator:
1.Blue goes to ECU
2.Blue/red goes to main fuses
3.Black/white goes to cluster

2-wire alternator:
1.Black/red goes to cluster
2.White goes to main fuse box

edit: I am guessing you don't have the pigtail..

Sti 3-wire is 1 2 3 with tab at top, 2-wire is 1 2 with tab on top
Just a small change to what what provided above...

The 2 pin connector on mine is:
1.White goes to main fuse box
2.Black/red goes to cluster

This is if you are looking at the back of the connector while it's plugged in, tab on top.

-Mike.
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Old 12-11-2008, 08:56 AM   #9
mpaone
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Member#: 3
Join Date: Jun 1999
Chapter/Region: South East
Location: Alfretter Geeoja
Vehicle:
2012 Geeteeeye
and 71' VW Gulf Beetle

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For anyone looking for the 3 plug connector, here you go.

http://www.cpgenerator.com/repairplugs.html

The one at the top of the page looks to be identical to the Subaru plug so I ordered one today.

-Mike.
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