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Thread: Logic Module Ground?

  1. #1

    Logic Module Ground?

    Which wire on the LMs is considered the ground for the LM? I see from this link, http://minimopar.knizefamily.net/ecu/lm-1987-t2.html, that red 24 and 25 are Signal ground source from fuel rail bolt and Signal ground to sensors respectively. Also, there are two grounds on the blue connector on 7 and 8, Power ground source from fuel rail bolt.

    I'm trying to get a better ground for my wideband to rule out any issues there, so which ground for the LM is best?
    [SIZE="3"] [B]Jon Trotter[/B][/SIZE] [B]1985[/B] Dodge Shelby Charger, Currently decommissioned [B]1987[/B] Shelby GLHS, #937 [B]1987[/B] Shelby Lancer, #628 [QUOTE=Reeves;587010]I can be ready. Please send pics of wife. _____DodgeZ add comments here______[/QUOTE]

  2. #2
    Hybrid booster
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    Re: Logic Module Ground?

    I just hooked up an Apexi AVC-R, which is a piggyback e-boost controller you tap into the wiring harness. For the grounds on it(there are two), I tapped into the Blue connector, pin #7 or pin #8 wires, both have a Light Blue w/red tracer.

  3. #3

    Re: Logic Module Ground?

    Cool, that's what I needed to know!
    [SIZE="3"] [B]Jon Trotter[/B][/SIZE] [B]1985[/B] Dodge Shelby Charger, Currently decommissioned [B]1987[/B] Shelby GLHS, #937 [B]1987[/B] Shelby Lancer, #628 [QUOTE=Reeves;587010]I can be ready. Please send pics of wife. _____DodgeZ add comments here______[/QUOTE]

  4. #4
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Logic Module Ground?

    The sensor signal ground is what I often use. However, for WB or other sensitive stuff I started to run it straight to the battery.

  5. #5

    Re: Logic Module Ground?

    I'll test it with the LM ground and see if it corrects the issue. If not, I'll definitely run it to the battery.
    [SIZE="3"] [B]Jon Trotter[/B][/SIZE] [B]1985[/B] Dodge Shelby Charger, Currently decommissioned [B]1987[/B] Shelby GLHS, #937 [B]1987[/B] Shelby Lancer, #628 [QUOTE=Reeves;587010]I can be ready. Please send pics of wife. _____DodgeZ add comments here______[/QUOTE]

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