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Old 04-23-2012, 09:24 PM   #1
tenchu
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Join Date: Jun 2004
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1993 STi RA V LTD
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Default HELP! JDM wiring guru's

I am currently attempting to swap over my wiring bulkhead. It appears (with some conversation and picture swapping with Supermoose) that I have gotten a SUPER old (~1992) bulkhead harness. And while MOST of the plugs I need are here, some are not. Keep in mind this harness is about 75% installed, and the old harness is only good for parts.

Heres where I realized the differences:

Old bulkhead had 3 main grey plugs that connected to engine harness. One coming through firewall to back of engine. 2 coming through fender under engine fuse box to side of engine.

New bulkhead has only the 2 wires coming from under engine fuse box.

Where the old bulkhead harness came through the firewall with 3rd main grey engine harness plug, it also had this 6 pin transmission plug:
(dark grey is transmission connector, light grey is 3rd engine plug (OLD BULKHEAD))



That connected to top of transmission here:


New bulkhead does not have EITHER of these plugs.


Does anyone have any ideas? Suggestions? Wiring diagrams? Anything that would help? I'm sure there are more differences that I haven't noticed yet. I haven't even gotten the motor in the car yet. I'm thinking I am going to have to cut that transmission/engine plug off the old bulkhead and splice to new bulkhead, but I would like a diagram to know where these wires run.
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Old 04-24-2012, 12:30 AM   #2
tenchu
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Update, after further inspection, this is what appears to be my new bulkheads version of the above 2 connectors. Instead of a 6 wire trans plug, it has a 4. Instead of a 8 wire (in 12 slot connector) plug for engine, it has (2) 3 wire connectors and (1) 1 wire connector. This:



Here is the only diagram I could find, though it appears this is for an even NEWER GC, as this diagram shows a VSS, whereas mine is cable.



So, for "B92" (trans plug) on OLD bulkhead I had the following wires (tab facing up, looking into side of connector that wires enter):

Black/Yellow || Light Green/Yellow || Red White
Brown/Yellow |....| Black/Red |....| Green/Black

And on the new bulkhead (same orientation):

Black/Yellow || Light Green/Yellow
Brown/Yellow | Black/Red

And for the engine plug "B93", old bulkhead same orientation:
open || Red (with silver dots?) | Cream | open
cream | ......... Green ........... | Black | open
Grey ..| . . . . . .Grey . . . . . . .| Grey | open

And new connectors:

Dark Grey connector:
Grey | Black | Cream

Light Grey connector:
White | Cream | Black

Single wire connector:
Cream or possibly white (hard to tell)




Possibly this could help someone help me? I have no clue, but I am trying to put forth as much effort as possible to make it as easy as possible for someone to lead me in the right direction.
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Old 04-24-2012, 02:16 AM   #3
elislider
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its probably because your car is an RA so it has DCCD and so the wiring to the transmission is different. the harness you got is either not an RA/DCCD or it is, but its a completely different iteration and they changed the wiring.

ive seen a lot of harnesses and ive never seen those flat 3-wire connectors before (in your last picture)
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Old 04-24-2012, 08:50 AM   #4
suberdave
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the last picture is your Cam Crank and Knock sensor. (like what is found on some EJ22ts) i did a 93 RA and it had the same connectors. all other EJ20Gs i have done have had them all togther in one plug.

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Old 04-24-2012, 09:19 AM   #5
tenchu
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Quote:
Originally Posted by suberdave View Post
the last picture is your Cam Crank and Knock sensor. (like what is found on some EJ22ts) i did a 93 RA and it had the same connectors. all other EJ20Gs i have done have had them all togther in one plug.

-=Suberdave=-
www.suberdave.com

So the (2) 3 pin connectors and (1) 1 pin connector for cam/crank sensors instead of the (1) 8 wire / 12 pin connector?

I can swap engine harnesses and cam/crank sensors on the engine to the newer style. But my question is how to go about getting the 8wire/12pin engine plug and 6wire trans plug in place of the current 4 connectors
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Old 04-26-2012, 06:58 PM   #6
elislider
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the single pin is probably for the temp probe in the coolant crossover pipe. or its for the oil pressure sender?
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