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Thread: e23 wiring harness routing

  1. #1
    Join Date
    Feb 2021
    Location
    connecticut
    Posts
    2
    My Cars
    1985 bmw 735i

    e23 wiring harness routing

    hi everyone, i am working on a 1985 735i. i bought the car with the engine partially disassembled. it had a bad head gasket, and some cam wear probably due to not adjusting the valves for a long time. I replaced the cylinder head, and i am in the process of putting it back together. When i bought the car, the intake and exhaust manifolds, and the cylinder head was removed. and i am trying to get the harness back in place, and i just wanted to see if anyone has photos of how their harness runs.

    As of right now it comes off the firewall then hooks down and runs over the injector valley. there is then like a hard 90 degree kink in the wire and a couple of harnesses come off of that, which go to the alternator, and I cant remember what else off the top of my head.

    It LOOKs like that 90 degree bend is supposed to snake between the intake manifold runners, and run down and to the alternator, but the connectors on the harness wont fit between the runners, so i would have to remove the manifold for that to work, and i have read people saying to remove and install the head and intake together.. so i assume it isnt going between the runners and under the intake, but as it is, it just looks weird, and it doesn't look like the wires to the alternator would reach.. I have definitely seen photos of the wire harness for the injectors being above the intake runners, so i have it in the right general area, but not sure what to do when it gets to that 90 degree kink, and i dont want to ruin gaskets by removing and reinstalling the intake a bunch of times to figure it out. I have looked for photos online, and cant find any good shots... i have a factory bmw service manual but no drawings in it that i could find.. Any help would be appreciated. Thanks!

  2. #2
    Join Date
    May 2013
    Location
    Killingworth, CT
    Posts
    514
    My Cars
    2000 750iL, 2001 X5
    I dug through a lot of my old 733i and 745i photos of the engine bay and couldn't find a photo taken from the right angle, but my best recollection is that the harness does go through the intake. I'm sure Eric will know the answer to this.
    Steve H.

  3. #3
    Join Date
    Feb 2021
    Location
    connecticut
    Posts
    2
    My Cars
    1985 bmw 735i
    Quote Originally Posted by BONDOSPECIAL View Post
    I dug through a lot of my old 733i and 745i photos of the engine bay and couldn't find a photo taken from the right angle, but my best recollection is that the harness does go through the intake. I'm sure Eric will know the answer to this.
    Yeah, pretty sure i have it figured out. I have a factory service manual, but the photos aren't very useful. But with the size of the connectors attached to the harness it didn't look like you could stuff it down that cutout between the intake runners very easily, but i was able to push it through, and it all seems to make sense so far interms of how its laid out.

  4. #4
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,292
    My Cars
    1983/84/85 745i
    Yep, harness slips through the intake manifold. Goofy to pull but can be done. Patience is key!

    Any photos of the work?
    I sell Motronic 013 ECU boost cut delete chips and drop in Tial conversions.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i (will be for sale!)
    IH, Ford, MB, Volvo, and GM round out the pack.



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