Body Harness Rewire Questions
12-05-23, 03:08 PM
#1
FlipFD, Round 2
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Body Harness Rewire Questions
I'm looking to simplify and re-loom a lot of the wiring in my car. A lot of the connectors (like half) are not connected to anything an just dangle freely since I have no ABS, A/C, Pop-ups, air bag etc, etc. I'm not experienced yet on electrical, but putting in the effort to learn what I need and get the proper tools.
I've ready most of the forum posts and annotated my own diagram of the front harness to show what is connected, what is deleted, etc. Although, I cant find the proper diagrams for what WIRES go to what from the connectors.
Big question ends up being, for those connectors going to nothing, is it enough to de-loom follow the wires from the dangling connectors and de-pin them from the other end, then re-loom with raychem/shrink wrap where necessary? Or should I expect a lot more interconnection, grounding issues or anything like that?
I've ready most of the forum posts and annotated my own diagram of the front harness to show what is connected, what is deleted, etc. Although, I cant find the proper diagrams for what WIRES go to what from the connectors.
Big question ends up being, for those connectors going to nothing, is it enough to de-loom follow the wires from the dangling connectors and de-pin them from the other end, then re-loom with raychem/shrink wrap where necessary? Or should I expect a lot more interconnection, grounding issues or anything like that?
12-06-23, 08:26 AM
#2
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Big question ends up being, for those connectors going to nothing, is it enough to de-loom follow the wires from the dangling connectors and de-pin them from the other end, then re-loom with raychem/shrink wrap where necessary? Or should I expect a lot more interconnection, grounding issues or anything like that?
it makes re-doing a stock harness like that really time consuming.
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j9fd3s (12-06-23)
12-06-23, 08:50 AM
#4
it will be an EXTREME amount of work to do what you're talking about. the benefit is 0 honestly. unless you're going for an ultra clean and tucked street car, its not in any way worth the time or trouble.
to answer your question, j9fd3s its absolutely correct.
to answer your question, j9fd3s its absolutely correct.
12-06-23, 10:38 AM
#5
I undertook this adventure a while back, I made amazing progress during the 'rona, but once life came back to "normal" I haven't done much.
It is a massive project, I mean massive. My fingers were raw just from peeling the tape and loom, then came getting the right tools to de-pin properly without ruining stuff...then finding replacement connectors....then finding decent wire and crimpers and pins....and then actually starting to trace wires, de-pin vs cut etc. I made a file explaining the connectors and wires in a '94 with labels saying what connects to what. Enjoy, feel free to hit me up.
Lots of the grounds and 5v supply are shared.
"It's dangerous to go alone! Take this"
https://www.rx7club.com/3rd-generati...guide-1129705/
It is a massive project, I mean massive. My fingers were raw just from peeling the tape and loom, then came getting the right tools to de-pin properly without ruining stuff...then finding replacement connectors....then finding decent wire and crimpers and pins....and then actually starting to trace wires, de-pin vs cut etc. I made a file explaining the connectors and wires in a '94 with labels saying what connects to what. Enjoy, feel free to hit me up.
Lots of the grounds and 5v supply are shared.
"It's dangerous to go alone! Take this"
https://www.rx7club.com/3rd-generati...guide-1129705/
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12-06-23, 11:06 AM
#7
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if you are going to undertake such a project why not wire a pdm in? it really simplifies things a lot and gives you the freedom to do what you want and with basic logic you can make it do whatever you want. No relays no fuseboxes.
just cleaning up the wiring harness. to do it properly it is a huge project
just cleaning up the wiring harness. to do it properly it is a huge project
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jkstill (12-07-23)
12-06-23, 12:15 PM
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You may not want to hear this, but you will probably be better served removing everything and replacing it with a PDU/PDM. Attempting to rework the OE harness is/will be a nightmare for very little gain.
R-R-Rx7 is spot on with the recommendation regarding the PDM. It gives you much more flexibility in how things are set up and you are no longer confined to the OE methods of power distribution and also control strategies.
Here's the wiring manual that I'm referencing for my process (full chassis rewire because I don't know when to stop). It's relatively straightforward but again, it will be a obscene amount of work if you are just trying to remove individual circuits and the end result will likely be less than satisfying for the amount of work you put into it.
https://drive.google.com/file/d/1x2g...?usp=drive_web
Hope that helps
R-R-Rx7 is spot on with the recommendation regarding the PDM. It gives you much more flexibility in how things are set up and you are no longer confined to the OE methods of power distribution and also control strategies.
Here's the wiring manual that I'm referencing for my process (full chassis rewire because I don't know when to stop). It's relatively straightforward but again, it will be a obscene amount of work if you are just trying to remove individual circuits and the end result will likely be less than satisfying for the amount of work you put into it.
https://drive.google.com/file/d/1x2g...?usp=drive_web
Hope that helps
Last edited by SETaylor; 12-06-23 at 12:23 PM.
12-06-23, 12:28 PM
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thank you, i did it on my 1st gen, because race car. it took ~6months. weight savings was around 1lb.
and
best part is that i get to redo it because it turns out that i need to add another relay so that the car isn't just on when the battery is plugged in!
so net/net having a couple of unused connectors was way more efficient
and
best part is that i get to redo it because it turns out that i need to add another relay so that the car isn't just on when the battery is plugged in!
so net/net having a couple of unused connectors was way more efficient
12-07-23, 08:46 AM
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my other car is an FC with an FD engine, and the engine harness V2 was to open up the FC harness take out what i don't need, and then add in the FD stuff i did need, but you can't the FD harness is like 18" shorter, so half of it was like a guitar string and the other half was coiled up on the deck. Mazda saved weight all over the FD. so FD engine harness has a ton of plugs on it, and does a bunch more stuff than the FC, but they probably weigh about the same
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b3delta (01-16-24)
12-17-23, 07:42 PM
#13
I undertook this adventure a while back, I made amazing progress during the 'rona, but once life came back to "normal" I haven't done much.
It is a massive project, I mean massive. My fingers were raw just from peeling the tape and loom, then came getting the right tools to de-pin properly without ruining stuff...then finding replacement connectors....then finding decent wire and crimpers and pins....and then actually starting to trace wires, de-pin vs cut etc. I made a file explaining the connectors and wires in a '94 with labels saying what connects to what. Enjoy, feel free to hit me up.
Lots of the grounds and 5v supply are shared.
"It's dangerous to go alone! Take this"
https://www.rx7club.com/3rd-generati...guide-1129705/
It is a massive project, I mean massive. My fingers were raw just from peeling the tape and loom, then came getting the right tools to de-pin properly without ruining stuff...then finding replacement connectors....then finding decent wire and crimpers and pins....and then actually starting to trace wires, de-pin vs cut etc. I made a file explaining the connectors and wires in a '94 with labels saying what connects to what. Enjoy, feel free to hit me up.
Lots of the grounds and 5v supply are shared.
"It's dangerous to go alone! Take this"
https://www.rx7club.com/3rd-generati...guide-1129705/
12-18-23, 06:35 AM
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