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Old 09-09-2018, 01:58 PM
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I've done few more harness since my first and all were fairly simple with the exception of one that had CANbus circuitry. That was fairly complex and required many more components to make the engine run properly. I did a quick count and my 2002-2005 WRX harness required only 12 wires extended as oposed to over 60 wired for CANbus version. Minimum number of wire cutting only works if you keep ECU at the back bulkhead or behind drivers seat and black fuse box with battery under the front hood. Otherwise many more wires need to be extended.
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Old 09-10-2018, 10:00 AM
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Quote:
Originally Posted by sector View Post
I've done few more harness since my first and all were fairly simple with the exception of one that had CANbus circuitry. That was fairly complex and required many more components to make the engine run properly. I did a quick count and my 2002-2005 WRX harness required only 12 wires extended as oposed to over 60 wired for CANbus version. Minimum number of wire cutting only works if you keep ECU at the back bulkhead or behind drivers seat and black fuse box with battery under the front hood. Otherwise many more wires need to be extended.
Ive only just started and I probably need to get a bit further. I didn't exactly follow your instructions which could be part of the problem! I started with the plug that connects between the fuse box area and the black fuse box to remove the "H-Shape" first, so I have been routing the front wires (headlights, radiator fans, indicators etc...) forward and then taking the feeds back via the other path that goes to the black fuse box. But I'm already finding that some wires seem too short making the distance between the black and brown fuse boxes too close.
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Old 09-15-2018, 06:27 AM
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Sector, I know you gave me detailed instructions before which I didnít exactly follow, but that was mine seemed a bit different.



Here is what I tried to do and why :

1) You had said make the black fusebox the forward most part of the loom.
2) The plugs circled in red are all bundles that need to be at the front of the car ahead of the black fuse box. (Headlights, Indicators, Radiator Fans etc..). All connected to a big SMU connector plus small one at the brown fuse box. So I figured Iíd get rid of the loop shape by bringing those wires anti-clockwise with the connectors and route back the other way, removing the loop. Now to leave the red bundles ahead of the black fuse box meant my return wires were effectively shorter, meaning I either extend or have the brown fuse box and black fuse box closer to each other.



I did notice in the picture of your loom that I didnít see the big grey SMU connector, did you do away with that as part of your process?

Also am I going about it completely the wrong way?
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Old 09-15-2018, 01:47 PM
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The big grey connector only goes to two engine connectors and when unfolded it looks like this.
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Since that branch is too long there are two options: to cut out that grey connector and re-solder all those wires at proper shorter length or fold that branch onto itself and secure it to the main bundle as I've done here
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Cutting out that connector and shortening that branch makes the harness look cleaner but in my opinion not worth the hassle. I've done harnesses with that connector removed but I've kept it in my personal harness. If you decide to take on that task, pay special attention to each wire as that bundle has same color wires connecting completely different functions.

Last edited by sector; 09-15-2018 at 10:29 PM.
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