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Old 10-11-2013, 10:41 PM   #1
rgarcia1983
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Default some wiring questions before I start harness merge tomorrow...

Alright, so I finally had a few days off, and was able to get 97-98 ej20g in to my 2000 2.5rs. I am starting wiring tomorrow morning and have some questions. First some info. My new engine came with ecu and a few feet of harness. Engine harness is complete and untouched.

My questions lie in the stock rs harness as far as many wires that go in to stock harness and ecu and not the new harness and ecu. Looking at my pinout, will the fuel level, fuel temp, fuel tank pressure sensor, small light switch, blower fan switch amd other wires cause issues once I clip those wires? More questions to come over coming days for wiring!
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Old 10-14-2013, 03:37 PM   #2
rgarcia1983
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Someone? Anyone?
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Old 10-14-2013, 05:36 PM   #3
Seahawk
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Location: Wilmington, NC
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1994 Impreza
w/ 03 WRX Swap

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In a nutshell you splicing in everything that controls the engine from the donor car's harness into everything that controls the body into your car's harness. There is not one definitive "how to" for this, particularly with a less common swap like the one you are pursuing. I suggest searching around a little more, perhaps on the "other" forum more oriented to GC Imprezas.

There are lots of resources out there, you will just have to spend your time and find them. FWIW, I am not exagerating when I say it took me at least 40 hours to merge a 2002 WRX harness into a 94 (this time only counting prepping and merging the harnesses, not removal or installation). Granted this was for putting an OBDII engine in an OBDI car, but the process was virtually the same.

Good luck!
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Old 10-14-2013, 07:27 PM   #4
DentMagnet
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dark green but looks blak

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Quote:
Originally Posted by Seahawk View Post
it took me at least 40 hours
How many wires? Info for estimates always comes in handy.
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Old 10-14-2013, 09:15 PM   #5
rgarcia1983
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Thank you! After lots of reading diagrams, I think I have the majority sorted. Ive spent weeks reading various threads on the subject. Im starting the actual merge in about 30 min so wish me luck!
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Old 10-15-2013, 02:22 AM   #6
davidsti1
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376whp GT3076R on E85

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Quote:
Originally Posted by rgarcia1983 View Post
Thank you! After lots of reading diagrams, I think I have the majority sorted. Ive spent weeks reading various threads on the subject. Im starting the actual merge in about 30 min so wish me luck!
Post DIY! And good luck
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Old 10-15-2013, 12:00 PM   #7
rgarcia1983
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i havnt really gotten any pics of the process, ive got 1 harness done, but ill start documenting everything and try to make another thread once its done and running.
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Old 10-15-2013, 07:01 PM   #8
Seahawk
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w/ 03 WRX Swap

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Quote:
Originally Posted by DentMagnet View Post
How many wires? Info for estimates always comes in handy.
I couldn't tell you, 100 maybe? I also merged all the needed signals from the GC body harness to the WRX cluster (high beam indicator, turn signals, door warning light, seatbelt light, etc).

Here's just the scrap pile of uneeded wires from both harnesses.


But like I said, mine was particularly more intensive. It really all depends on the swap, the car, and what you use of the two. But the process is all the same. Good wiring diagrams and the ability to read and understand them, a lot of patience, a little faith, and a lot of work are all needed.
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Old 10-16-2013, 02:28 PM   #9
DentMagnet
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Quote:
Originally Posted by Seahawk View Post
I couldn't tell you, 100 maybe? I also merged all the needed signals from the GC body harness to the WRX cluster (high beam indicator, turn signals, door warning light, seatbelt light, etc).

Here's just the scrap pile of uneeded wires from both harnesses.


But like I said, mine was particularly more intensive. It really all depends on the swap, the car, and what you use of the two. But the process is all the same. Good wiring diagrams and the ability to read and understand them, a lot of patience, a little faith, and a lot of work are all needed.
Thanks. Good pic, tell people it's "art" and you can get big bucks.
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Old 10-16-2013, 07:19 PM   #10
Seahawk
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1994 Impreza
w/ 03 WRX Swap

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Quote:
Originally Posted by DentMagnet View Post
Thanks. Good pic, tell people it's "art" and you can get big bucks.
Ha! It's all stuffed in a giant box now! But would make a great center piece for a living room!

Organization and a good place to work is key too; I had my stuff taped to the garage floor. This was just the dash section, it went all the way back to the taillights.



OP, how is your merge going?
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Old 10-16-2013, 09:53 PM   #11
rgarcia1983
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Its going well so far. Im now at some engine controls as far as what I have left. There are a few issues that worry me but im saving that for last. I was using old crappy strippers and bought new ones today, the self adjusting kind. Should make it a tiny bit quicker.
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Old 10-25-2013, 06:55 PM   #12
rgarcia1983
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I haven't had a chance to work on car since my last post, bit while going over both the donor car and my 2.5rs wiring diagrams, im seeing that the various data check and read memory wires are quite different. The engine control stuff seems straight forward from what I have left but im not sure what to do with read memory wires running to ecu and data check wires. Again, car is 2000 2.5rs with 1997/98 wrx wagon ej20g (3 plug) ecu, and harness connector for ecu. Any insight?
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Old 10-25-2013, 07:34 PM   #13
rgarcia1983
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What I mean is the wiring is very different.
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Old 10-27-2013, 07:22 AM   #14
Seahawk
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w/ 03 WRX Swap

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Quote:
Originally Posted by rgarcia1983 View Post
What I mean is the wiring is very different.
I can only speak in generalities because I'm not really familiar with the wiring for your car or your swap, but basically you should keep everything pertaining to the ECU, etc from the donor harness and merge that into everything that controls the body stuff (wipers, lights, etc) on your car.

Start with the donor harness and trim that back to just what you need, including those data check wires you mentioned. Then remove the similar stuff from your car harness. Then merge the two together.

Again, all of this can vary greatly depending on what you are keeping from your car, such as cluster, cruise control, and other things that rely on ECU signals to work.

There is no simple answer, it takes a lot of time, thinking, wire chasing, and testing to make it work. Take your time, don't rush, triple check everything.
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Old 10-27-2013, 07:23 AM   #15
Seahawk
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w/ 03 WRX Swap

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Also there are some excellent threads on the RS25 forum that are very helpful. Google "Brydon teaches you to merge a harness".
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Old 10-27-2013, 10:01 AM   #16
rgarcia1983
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Well, one of the issues is that my donor harness consists of the engine harness and ecu harness. Ecu harness is cut at fire wall except for maybe half the engine control wires that run to ignitor, wastegate, etc. Tracing paths in diagrams shows me my engine control wires are correctly done and soldered, except for two wires that are shared among items that I just havnt gotten to yet. but as far as the data check and read memory wires, I dont have the actual plugs, just aboit 2-3 feet of wire from ecu that ends where it was cut.
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Old 10-27-2013, 10:06 AM   #17
rgarcia1983
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I need to start an account on rs25 anyways. And I have to read the brydon merge thread from start to finish. I dont regret the project yet, but it is pretty confusing at times. Though ive found that if I step away at those times and get back to it after a day or two, it was easier than I had thought. It's a good experience.
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Old 11-04-2013, 04:12 PM   #18
rgarcia1983
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No help on other forum. Does this mean I have to wire everyrhing on those data check/read memory plugs from scratch to match turbo diagram?!
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