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Old 12-29-2003, 09:47 PM   #1
Scooby Newbie
Member#: 51525
Join Date: Dec 2003
Default A question on wiring

I am planning on buying a 97+ Imprezza L AWD and want to do an EJ20 swap awhile afer I get the car. My question is this:

Would the wiring be done by feeding the WRX harness throught the firewall, cutting out everything non engine related from the WRX harness, and then matching the wires from the Ls interior harness to the WRXs harness?
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Old 12-29-2003, 10:08 PM   #2
Scooby Specialist
Member#: 3362
Join Date: Dec 2000
Location: Central NJ
2001 I've wired a
Few cars in my day


pretty much that but it's a little more involved. shoot me an IM once you get started.

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Old 12-29-2003, 11:04 PM   #3
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Location: North of the border
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Basically when you strip down the stuff you don't need , what you end up with is a stand alone engine harness. The only stuff you splice into the car is stuff like ecu power, fuel pump relay, tach , water temp gauge, speedo, rad fans, etc. There is roughly 10-15 wires you have to splice. But that seems to vary from swap to swap.
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Old 12-30-2003, 01:43 PM   #4
Homicidal Maniac
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
2008 STI


There are a couple who have done this recently or are currently doing it (myself included) so just ask specific questions and you will get some help.

Personally, I'll be tapping into the power for the WRX harness, using the WRX fuel pump relay, tapping the water temp gauge, fuel gauge, oil pressure, tach (basically, gauge cluster stuff), radiator fans, reverse switch, OBD-II, and integrating my existing alternator/battery wiring into the system. My A/C is being removed so no need to integrate that.

More or less, what you need to do is feed power to your WRX engine management harness and tap any signals that must go back into your existing harness.

Here is a good link to read that can be found in the wiring section of the FAQ.


Last edited by stimpy; 12-30-2003 at 01:48 PM.
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