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Thread: Rewiring a car, how much of a cunt is it?

  1. #1
    Angry horse Mr Ed's Avatar
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    Rewiring a car, how much of a cunt is it?

    Wiring in my car is fucked after the engine conversion. New circuits are drawing current from old circuits and theres alot of wires that arent being used or are doubled up.

    Having problems with short circuits at the moment and its driving me insane, strongly considering stripping it all out, buying a wiring kit and re-wiring the lot. (Ie. Body loom, fuse box, the lot)

    Would keep the existing engine/tranny loom but everything related to the body would go.

    Anyone done this? How much of a nightmare is it?
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  2. #2
    Angry horse Mr Ed's Avatar
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    To clarify, the problems are likely caused by my own work, not the by the work that various people have helped me out with.
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  3. #3
    Bannered takai's Avatar
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    Depends on how much functionality you want.
    I have just brake lights, indicators, headlights, wipers and demister in the race car and it was still a sweet pain in the arse.
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  4. #4
    Boob dude to4garret's Avatar
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    i just made a custom engine harness for my car.

    i will not do it again, total head fuck trying to integrate it with the stock body harness. took a month of a few hours a night, but im a slack worker and like to re check things many times.

    ended up with this



    with all of this left over...



    sore rainbows of wire colours for weeks afterwards

  5. #5
    Angry horse Mr Ed's Avatar
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    Yeah mine looked like that but much worse. I threw out about 20kg of wiring when we were done!

    Only basic operation needed. Might keep the electric windows, only cos it would be easier to keep them than to replace the motors with manual winders.

    Gauges, fuel pump, headlights have to be re-done anyway....figure thats quite a bit of the work.
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  6. #6
    Opens HoonBoy's Avatar
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    Major pain, but worth it in the long run assuming you don't throw out the pieces of paper with the diagram on it

    I'm about to do it on my second car to remove the fuel injection, body computer, auto controls etc. Don't expect it to be fun!

  7. #7
    Angry horse Mr Ed's Avatar
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    Id probably remove all the shit behind the dash at the same time and simplify everything, most wiring would be far easier to get to that stock.

    There are no 100% correct english diagrams for my car at the moment so even without diagrams, after a complete re-wire its not going to get any harder to figure out.
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  8. #8
    Opens Forg's Avatar
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    I reckon starting from scratch is a billionty times easier & quicker than splicing in parts of looms together; the only thing is not to run out of patience (like I repeatedly did), and to use the correct colour wires ... I've got too many places in my car where I ran out of light green with a white stripe & the last few metres are red with a light green stripe.
    Mr Mango & Mr Pear are my heroes!!

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  9. #9
    Registered User Calibrator's Avatar
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    its a fair cunt of a job probably a bigger cunt than dave
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  10. #10
    Opens Forg's Avatar
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    I guess my car was carved out of stone, and uses roughly smoothed pebbles for electrons inside hollow straws for wires ... an early 90's Supra would be somewhat more of a complex PITA.
    Mr Mango & Mr Pear are my heroes!!

    (*) Assisted by Boeing Drivers in 2005.

    If were a girl I'd have a Toyota Starlet GT Turbo

  11. #11
    FJ20DEBT NISMOgemini's Avatar
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    http://www.aussieautoloom.com.au/

    its a massive head fuck.. but worth it in the end.. i got rid of SO much shit.. and it was a good learnign curve.. and atleast this way when somethign goes wrong u knowwhere to loook, unlike th efactory wiring loom when u would need 15 differnt diagrams to work it out.

    i hated it, but in the end im glad i did it
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  12. #12
    FJ20DEBT NISMOgemini's Avatar
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    Quote Originally Posted by Lobster View Post
    Freeze a gearbox and slide it under his front door

  13. #13
    Registered User RB30-POWER's Avatar
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    some cars the body harness and engine harness are seperate, now most of it is all intergrated together, making more of a pita to work on.

    you either need to wire it right in the first place, or strip it and create a new engine harness with it's own power relays etc.

    nissans are reasonbly good, toyota's are a royal cunt, but i hate their engine managment in general, way over complicated, circuit opening relays, voltage sense wires, all bullshit, not needed to begin with, they should have simplified save cost on wiring and weight.

    what sort of car?

  14. #14
    Angry horse Mr Ed's Avatar
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    Toyota GA70 supra (same as MA70) with 2JZ conversion. Looms are separate.

    Already went though this, rest looks easy based on NISMOgemini's photo:


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  15. #15
    Angry horse Mr Ed's Avatar
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    Quote Originally Posted by Forg View Post
    .. I've got too many places in my car where I ran out of light green with a white stripe & the last few metres are red with a light green stripe.
    Pretty sure this is what Toyota did in their cars from the factory.
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  16. #16
    FJ20DEBT NISMOgemini's Avatar
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    yeah mine was pretty simple (universal hotrod kit).. just very time consuming....
    Quote Originally Posted by Lobster View Post
    Freeze a gearbox and slide it under his front door

  17. #17
    Angry horse Mr Ed's Avatar
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    Cant help but think you guys really should have talked me out of this. You almost make it sound easy which I can basically be gaurenteed wont be true.
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  18. #18
    あなたの母親の肛門 Shifty's Avatar
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    You obviously didn't read any of the replies.

    Everyone said it was a fucking cunt of a job.

  19. #19
    あなたの母親の肛門 Shifty's Avatar
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    wtf is wrong with you?This job is way too hard for you, if you don't understand these comments I've taken directly from people's posts:

    it was still a sweet pain in the arse
    i will not do it again
    total head fuck
    Major pain
    its a fair cunt of a job
    an early 90's Supra would be somewhat more of a complex PITA
    its a massive head fuck
    a pita to work on
    toyota's are a royal cunt

  20. #20
    Angry horse Mr Ed's Avatar
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    Yeah and it seems some peoples ideas of a cunt of a job might not be as bigger call as others.

    NISMOgemini pic didnt look too bad at all.

    Also:
    I reckon starting from scratch is a billionty times easier & quicker than splicing in parts of looms together
    yeah mine was pretty simple
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    Unfinished Project is a cunt
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  21. #21
    FJ20DEBT NISMOgemini's Avatar
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    Quote Originally Posted by Sir_2jza70 View Post
    Yeah and it seems some peoples ideas of a cunt of a job might not be as bigger call as others.

    NISMOgemini pic didnt look too bad at all.

    Also:

    that cos mines a universal kit, (IE rip EVERYTHING out and install universal hotrod kit.. )easy enough, but still a dick in the ass...
    Quote Originally Posted by Lobster View Post
    Freeze a gearbox and slide it under his front door

  22. #22
    FJ20DEBT NISMOgemini's Avatar
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    plus mine was a gemini, not a modern toyota... a game boy has more wiring then a gemini
    Quote Originally Posted by Lobster View Post
    Freeze a gearbox and slide it under his front door

  23. #23
    Angry horse Mr Ed's Avatar
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    Engine loom doesnt really need to be touched, i dont care really about functionaltiy so if all the blinkers n shit get replaced with 60s technology I dont really care.

    Still only doing it if I cant figure the rest of shit out.
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  24. #24
    Registered User Rz's Avatar
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    i went nuts on my poopra wiring but i didnt have to worry about keeping anything operational other than lights/dash.
    engine stuff has its own seperate loom.

  25. #25
    Angry horse Mr Ed's Avatar
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    Quote Originally Posted by Rz View Post
    i went nuts on my poopra wiring but i didnt have to worry about keeping anything operational other than lights/dash.
    engine stuff has its own seperate loom.
    This is pretty much my understanding and much the same as what I plan to do.

    Air con is already disabled, will completely remove it, the heater core and all the associated fans/ductin if/when the dash gets stripped. Might annoy me not having a fan but I can always rig some simple little setup with a toggle switch if neccessary.

    RZ: Youve still wipers, blinkers, high/low beam and reversing lights dont you?

    What about electric windows?
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  26. #26
    Registered User Rz's Avatar
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    yeh man , all lights and wipers.
    culled most the door control stuff but the windows still wind

  27. #27
    Registered User Rz's Avatar
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    best advice i can give you is to totally remove the loom from the car , every last bit and lay it out , 10x as easy as working in the car.
    even doing it this way took me a solid week of working out what to remove and what to leave.
    i would have less than 5% of the original wiring left now.

  28. #28
    Angry horse Mr Ed's Avatar
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    5% you say? Thats what I like to hear

    Ive just negociated myself a new garage to work in so looks like this will be good to go.

    So what do you reckon, get a big sheet of ply or something I can nail into/write on, then pull the loom out and pin it up on the board?

    Ive never been able to quite get my head around how you know how to make a loom on a board without getting all the wires the wrong length. I guess it would be easy enough if youre working on top of an existing loom though.

    So did you swap all the old plugs over to the new loom or buy new ones? Old plugs suck to work with but new ones would be a major PITA to get hold of.
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  29. #29
    Angry horse Mr Ed's Avatar
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    Oh and did you buy one of those loom kits or just wire by the metre?
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  30. #30
    Registered User Stix Zadinia's Avatar
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    why would you take out air conditioning?
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    Would bang. Did bang. Marrying that shit.
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