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Thread: HOW to: LM/PM to SMEC wiring harness conversion

  1. #1
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    HOW to: LM/PM to SMEC wiring harness conversion

    10-23-2014


    LM/PM to SMEC wiring.
    Note: This is using a 1987 T2 LM/PM harness, and a 1988-89 T2 SMEC harness


    With every harness I build, I become more and more efficient with this conversion.
    There was trouble with Pin #11 in the "L" body harness.
    This is a brake signal that goes to the LM for cruise control equipt vehicles.
    The engine compartment connector in Pin #11 is deleted, along with the wire.
    However, the connector on the interior side of the bulkhead connector is left untouched,
    as it is where the high mount brake light circuit will be completed.
    (ie; the engine bay side has only one 18WT/TN wire, and the interior side has two wires. PITA figuring out, but I got it! lol)


    Also, note the W/S wiper wiring as well.
    The entire W/S wiper/washer harness of the "L" body harness is left untouched, other than the ground(18BK) wire,
    which is simply cut and soldered to the ground wire(18BK) of the "G" body W/S wiper/washer harness after it is cut.
    This is really useful, in that the "L" body uses a completely different method to pass the wiper/washer wiring into the cowl.
    ("L" body owners know the little black "wire-pass thingy" I'm talking about. lol)
    The "G" bodies apparently use an actual grommet to pass these wires through the body metal to the cowl.


    I sure hope anyone who attempts this procedure finds this diagram useful.


    Here's a copy of the 40-pin bulkhead connector I.D.,
    after the modified SMEC harness installation.



    Here's a link to a folder of several pics of the process:
    http://s121.photobucket.com/user/sig...0SMEC%20wiring


    Here's a thread I posted in while doing some figuring, it may help others:
    http://www.turbo-mopar.com/forums/sh...ith-a-few-pins

    I may start a "Services Offered" thread if there's enough interest.
    Reply here or send me a PM.


    Thanks, in advance.
    Have a great day TMers!
    Last edited by knownenemy; 11-13-2014 at 11:17 AM.

  2. #2
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Interested in the service. Do you have any pictures of a completed harness ?

    Also can you go into how you complete the conversion and what materials/donor harnesses/etc that you use ?

  3. #3
    Supporting Member Turbo Mopar Contributor
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    pics?
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Quote Originally Posted by wowzer View Post
    pics?
    Yeah, sorry about that wowzer.
    I think I made a change to the diagram, and switched the pic at PhotoBucket, and didn't update the addy. oops!

    Should be good for you now.

  5. #5
    turbo addict Turbo Mopar Contributor iTurbo's Avatar
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    I have done a few SMEC conversions and also an SBEC conversion myself. Just wondering if you are proposing somehow using an SMEC with a harness that was originally LM/PM? That seems like a really daunting task and inelegant because of the fundamental differences between them. I've seen guys stick SMECs in there glove box to do this, but there are a lot of ways to skin a cat for sure. Not trying to be critical, I just would like to know more about your particular method for doing this. Forgive me for being ignorant at this point.

  6. #6
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Subbing. Im curious too.

  7. #7
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Quote Originally Posted by iTurbo View Post
    Just wondering if you are proposing somehow using an SMEC with a harness that was originally LM/PM?
    I just would like to know more about your particular method for doing this.
    Forgive me for being ignorant at this point.
    Quote Originally Posted by ShadowFromHell View Post
    Subbing. Im curious too.
    Not at all iTurbo.
    I'm basically modifying the SMEC harness from an 88'-89' "G" body,
    to work with the 87' "L" body bulkhead connector.
    This way the "L" body interior, and controls will operate the SMEC.

    Also, I replace the necessary plugs, and connectors when I do this mod.
    (ie: lighting, etc)

    No need to forgive anyone. Interest is the mother of advancement my friend.

  8. #8
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    id be interested in the service... would we have to supply the harness's

  9. #9
    turbo addict Turbo Mopar Contributor iTurbo's Avatar
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Right on, that is not at all unlike I what have done it the past and it worked well! Some people have gotten butt-hurt in the past with me asking questions and suggesting a different route in the best interest of advancement so..

    It sounds like you have things figured out pretty well. In the past I have done SMEC conversions on an Omni GLH using an '89 Caravan turbo harness, and then I also modified an '88 Horizon TBI harness to Turbo II. My Shelby Lancer is currently running a '91 harness/SBEC from a Lebaron GTC. Also made myself a custom 40-to-50 pin bulkhead adapter for testing purposes. Fun stuff.

  10. #10
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Quote Originally Posted by OmniLuvr View Post
    id be interested in the service... would we have to supply the harness's
    Yes, you would have to supply the harnesses.
    I have some of the wiring here to complete a few circuits if they are questionable.
    (Yes, I check every circuit in the entire harness, including all ground splices)

    The best harnesses to acquire to modify the 87 T2 LM/PM harness is the T2 SMEC "G" body harness.
    There are many folks who don't like the "G" harness due to the additional length of it,
    but I feel that having more is FAR BETTER than not having enough.
    Plus, when someone places an order, many details are discussed prior(ie: PDC or not, positioning, etc.)
    If someone prefers a PDC over the fuselink set-up,
    the additional wiring is really helpful for positioning the PDC.

    Send me a PM, and we can discuss details if you're interested.
    Thanks, in advance.

    Quote Originally Posted by iTurbo View Post
    Right on, that is not at all unlike I what have done it the past and it worked well! Some people have gotten butt-hurt in the past with me asking questions and suggesting a different route in the best interest of advancement so..

    It sounds like you have things figured out pretty well. In the past I have done SMEC conversions on an Omni GLH using an '89 Caravan turbo harness, and then I also modified an '88 Horizon TBI harness to Turbo II. My Shelby Lancer is currently running a '91 harness/SBEC from a Lebaron GTC. Also made myself a custom 40-to-50 pin bulkhead adapter for testing purposes. Fun stuff.
    Yeah, I've come across the occasional attitudes here and there,
    but I prefer to be known as someone interested in the best interests of the community.
    (even though my screen name here is "knownenemy"(kind of a reverse polarity thing. lol)

    Over on the other forum my handle is signsoflife22.
    There's a "HOW To" thread there as well.
    Although at both forums there are individual questions answered in several other threads.
    I was asking questions as I discovered simpler ways to modify.

    Case in point(and a point I have yet to note at either forum),
    the windshield wiper and washer electronics for the "L" body need not be touched at all.
    They remain in their factory positions in the bulkhead connector,
    and the cowel electronics harness is able to keep the "L" body specific wire pass through thingy. lol
    (that little black flat piece that mounts under the hood seal, but on top of the cowel divider)

    I used to have the handle "signsoflife22" here as well, but forgot the password years ago.
    I've inquired to mods about it, but never got a response. Oh well.

    BTW: Edited the original post to include the 40-pin bulkhead pin-out for the SMEC.

  11. #11
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    The '88-'89 G-body Turbo II harness is a great place to start for most conversions. And the '89 turbo Caravan harness as well.

    If I were to ever do this again for an L-body, I would surely go with the '88-'89 L-body TBI harness as a starting point. It is a lot of work, but you end up with something that fits like a glove and looks totally stock on a GLH Turbo or Shelby Charger and is even better than the unavailable Mopar Super 60 harness. Of course, the customer would have to provide you with both a '88-'89 L-body TBI harness and a G-body TII harness to make this happen. And pay a premium for the work involved of course.

    I myself have a '90 Omni TBI SBEC harness and '91 Spirit R/T harness stored away just in case I ever get around to converting my old GLH Turbo to Turbo III.

  12. #12
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    Re: HOW to: LM/PM to SMEC wiring harness conversion

    Inserted link to a folder containing pics of the process, in the first post.

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