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Painless 10150 For 1975 Cj5

Discussion in 'Intermediate CJ-5/6/7/8' started by 75CJ512JK, Dec 4, 2019.

  1. Dec 4, 2019
    75CJ512JK

    75CJ512JK New Member 2020 Sponsor 2019 Sponsor

    Tucson AZ
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    It is my understanding that the 75 wiring is similar to the 76+ wiring aside from a few 75 specific items. (ie Spartan Turn signal, ignition on dash)

    The Painless 10150 is the new version of the 10110. Called Painless and the Engineer that designed that specific harness said with some slight modification ("rerouting dash wiring") it should be a the closest to a direct fit.

    I have read many threads on different forums but I am still a little unclear as to what exactly won't be plug and play between the 10150 (10110) and the 75 CJ5.

    Edit: This thread contains a few users that chose the 10110 on their 75's:

    wiring harness 75 cj5 choices


    Any wisdom would be appreciated.
     
    Last edited: Dec 4, 2019
  2. Dec 4, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Do you have the '75 TSM? The wiring diagram for the CJ is in there. Compare that to the Painless diagram.

    No "hot rod harness" like the Painless product will be plug-and-play. It comes with a fuse panel with a bunch of un-terminated wires. You are expected to install the panel, route the wires, and terminate the wires at the devices you have, like the lights, switches and so forth.

    The factory wiring harness is custom-made to be the right length and has the right terminations to plug-in to the vehicle. All this stuff is designed to be assembled by the factory crew quickly. This is "plug-and-play," but extensive design and testing went into making these harnesses. The hot-rod harnesses are nothing like that.

    A '75 is the first year for the through-the-firewall bulkhead connector that is integrated with the fuse panel. When you remove that, there will be a big hole in the firewall that you'll need to fill with ... something. The hot rod harness comes with a fuse panel meant to mount flat somewhere on the hot rod, typically under the dash. It's then up to you to route the wires through the firewall and to the rest of the Jeep.

    What do you have now for wiring?
     
    Rubicloak likes this.
  3. Dec 5, 2019
    75CJ512JK

    75CJ512JK New Member 2020 Sponsor 2019 Sponsor

    Tucson AZ
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    Right now its stock.

    Going to start a frame-off with some modernization mixed in. HEI, EFI, etc.

    I'm okay welding a cover over the hole for the old bulkhead. That doesnt sound like anything too difficult.

    So if I'm understanding correctly, I'll need to fashion another way for the front/engine bay wiring section to get through the firewall from the fuse box that will be located on the inside...
     
  4. Dec 5, 2019
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2020 Sponsor 2019 Sponsor

    cordele, Ga.
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    Yes you will. Like the early jeeps used a rubber type grommet for the wires so it will be protected from chaffing.
     
  5. Dec 5, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    What's wrong with the factory wiring? I'd add an auxiliary panel to power your modernization, rather than rip out the factory wiring. Why reinvent the wheel?
     
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  6. Dec 6, 2019
    75CJ512JK

    75CJ512JK New Member 2020 Sponsor 2019 Sponsor

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    Well the wheel was re-invented many times over as technology, material, and processes got better. So my thought was 45 year old wiring, wire insulator, connectors, etc. might be worth replacing with something new while the frame-off was happening.
     
  7. Dec 6, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

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    I'm sure you understand what I was trying to suggest by using a popular expression. By all means, make the wiring anew if you have the time, means and it's important to you.

    IMO it's more an aesthetic choice than a practical one, unless there was a fire or wreck or such. I have had - at most - only minor problems with factory wiring on my '75, '77, and '82 Jeeps. The wiring does not seem to me to deteriorate as much as you might imagine. The insulation is vinyl and does not seem to age much where it's protected from UV. I have no trouble understanding the factory wiring diagrams, and it seems to me that the factory documentation is both more specific and more detailed than what you might get with an aftermarket harness.

    This thread discusses maintenance and repair of factory harnesses extensively - https://www.jeepforum.com/forum/f8/basic-wiring-101-getting-you-started-1340134/ - not unreasonable to spiff up a few bits here and there using some new parts.
     
  8. Dec 6, 2019
    sterlclan

    sterlclan Member

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    Fwiw the hole in the firewall is the same as a square body Chevy truck. Most of the things you sound like you are doing would be easily accomplished with a harness from an 87 this would have the ecm harness for your efi as well.
     
  9. Dec 6, 2019
    75CJ512JK

    75CJ512JK New Member 2020 Sponsor 2019 Sponsor

    Tucson AZ
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    I do understand and I wasn't trying to sound like a smarta--. The Jeep was stored outside in New Mexico all its life and the wires look decent, but when the project is finished I want to know that ever inch was checked and if possible improved in one way or another.
    Sentimental maybe, a labor of love for my old high school jeep, and maybe this is one of the times I'll look back and say, "Damn, I wish I would have listened to the wisdom from the Jeep elders." At this point I might stick with stock and keep the Painless kit in the personal inventory.

    Either way,
    I was looking through the kit (Black Friday special on Painless) and the Painless fuse block/bulkhead looks like a direct fit (minus bolt size) for the stock 75 firewall. Pics Attached. Am I missing something here? It looks like no modification would be necessary. Jeep Bulkhead.jpg Painless.jpg

    Again, thanks for the wisdom.
     
  10. Dec 7, 2019
    sterlclan

    sterlclan Member

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    yup looks like your standard gm style plug, if you have the painless kit already use it the wiring on these isn't terribly complicated.
     
  11. Dec 9, 2019
    Raven74CJ5

    Raven74CJ5 New Member

    san diego,...
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    Just got done not to long ago installing a painless kit on my 74... took 2 days to completely removed and rewire the whole thing... and im glad I did. As I was going through the old wiring I found a lot of placed where the wires were cracked and oxidation set in causing the wires to corrode. I too upgrade with a few modern perks on my jeep by adding a high amp single wire alternator and an HEI distributor. IMO its definitely worth the time and effort to upgrade to new wiring especially with the newer modern upgrades in electronics these days.
     
    75CJ512JK likes this.
  12. Dec 9, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

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    Actually kind of cool that the bulkhead connector is a standard thing. Likely another instance of AMC/Jeep taking existing big-three parts and adapting them to their purposes. Using the GM-style bulkhead connector, they bypass all the R&D needed to develop the connector for their vehicle, and they only have to change the wire colors and lengths. I wonder how common the fuse layout in the panel is to other vehicles?
     
    75CJ512JK likes this.
  13. Dec 9, 2019
    sterlclan

    sterlclan Member

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    I would bet pretty similar I’ve used older harness with late model and vice versa to add injection to a pre 87 Chevy square nose. you just add the wire for the pump to the engine side of the bulkhead and add the engine harness for the ecm all plug and play.
     
    Last edited: Dec 9, 2019
    75CJ512JK likes this.

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