Posted on 13/2/2022
Back in 2015 I carried out the EFI conversion on the Civic, which also included a wiring conversion, for the B18CR. In Australia, these come factory with a D15B4 Dual Carb setup. I achieved the conversion by grapping a complete wiring harness from a OBD1 Integra DA9 and extracting everything from the ECU plugs to the engine, making it into a standalone harness, laying it over the ED body harness and connecting various wires at 1 point between the two.
Over the years I've learnt a lot more, and seeing the top spec motorsport wiring harness vs how I did mine, I've always wanted to revisit my entire harness and redo it. This will take time, and ideally I'd get a spare ED body harness and work on it on the side, as I'd like to remove all the wires from the old carby ECU plugs, AC, etc.
To start with this, I thought I'd tackle the dash harness as I'd like to put some block off plates where the AC unit & radio once were. Whilst at it, I thought it'll be a great time to remove those wires from the harness, and clean up some of the soldering job I did in car when converting to the SiR cluster. Don't judge my bolting solution pls, just using spare hardware I had lying around
I also got some new wiring supplies/tools. I always used to solder everything, but with the knowledge I've gained, you don't want to use solder in the motorsport game unless if it's needed, and then you still don't want to. However for this job, I've decided to solder a few things together. I'll need to look for some crimps I can used instead in the future.
In the past I've done some neat soldering, but when lying upside down underneath the dash it's sometimes a little hard to do it neatly when gravity is working against you. Name and shame myself, but hey we are here to fix it!
Heres the dash harness we are dealing with, along with starting to strip it back, removing the aftermarket radio plug, etc
The stripped down version, along with what was removed.
Some neater solder & heat shrinking, along with consolidating it into 1 point, instead of 2 as the earlier photo!
The final product, for now.. The Weber BBQ box make for a decent portable bench! With the harness now resecured to the dash, the dash was then bolted back into the car. Lying underneath the dash seems to get comfier the older I get.. hmm..
I installed this progressive shift light a few years ago after always wanting one, however I never got it working. It was hard to configure through the menus, and then I believe a wire I did come lose and it's never had power since. I decided to add a deutsch connector (my first one ever) so it could be unplugged when removing.
Very neat outcome, with some 7mm corrugated split tubing to hide the wires, don't have any fancy teflon stuff but maybe one day when I get some proper electrical supplies built up.
I mentioned at the start of the post I wanted to redo the entire harness, and this section was one of the main reasons. The way I did the EFI conversion was making a standalone ECU to engine harness which laid on top of the ED cabin harness.
This meant the old carby ECU plugs were cable tied back (blue and yellow ones top right behind the HVAC box), along with other things like AC (wires on the left bundled up) and other various wires dangling about. Also the way I pulled the shock tower plugs back intot he cabin meant there was excess wires & plugs hanging about.
As you can see I made a mess of the sound deadening when removing during the EFI/B18C swap. I showed in older posts where I used dry ice for the floor, but it was harder to get it to work on the slanted parts, like here. So I used the a heat gun and chisel from memory to scrap off the rest.
In the long run I'd like to:
Also cleaned up the indicator/wiper stalk as it was out, years of dried up skin/whatever else from previous owner, and probably some of my own.. lovely
Before:
After: