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Thread: M-12071-a50 ford racing harness

  1. #1
    Club Member JeffB's Avatar
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    Default M-12071-a50 ford racing harness

    Does anybody know where this could be purchased at? Our fuse relay control module went out, so looking for a new one of those or a complete kit. Ford racing said they do not have any. Previously bought it at Dunne-rite performance, but they are no longer in business. Thanks for any help.
    Jeff
    Last edited by JeffB; 05-20-2019 at 04:53 PM.

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    Club Member mustangmike6996's Avatar
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    Are these it? LMR looks similar but universal.

    https://lmr.com/item/LRS-93CWH/Musta...SABEgLx1PD_BwE

    http://www.mustangsunlimited.com/Mus...0L-Mustang.axd


    What exactly happened to your module, can it be fixed?

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    Club Member JeffB's Avatar
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    The one at Mustangsunlimited is the same. I have found them listed but no stock. I really would like to find the module or find someone to check it out. This is in a 49 Ford F1 with a 5.0. Was having issues with the fuel pump not running. Played around with the module then it would work for a couple start ups. Now the fuel pump runs all the time like the relay is not shutting off. Also it started backfiring through the intake at the same time and is running terrible and very rich. It was running good except for the fuel pump issue. That is why I think it is the module. Any idea who would fix it or check it out? Thanks

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    Club Member mustangmike6996's Avatar
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    It could be a pretty simple fix. I am not too familiar with that harness but from the looks of it, a new relay could be soldered on the circuit card. The running rich/backfiring could be a related or completely separate issue.

    Can you post pics of the relay module? Where exactly are you located?

  5. #5
    Club Member JeffB's Avatar
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    Living in Florida now. Tried several times but could not post a picture of the module.

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    Club Member mustangmike6996's Avatar
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    Quote Originally Posted by JeffB View Post
    Living in Florida now. Tried several times but could not post a picture of the module.
    The only way I can post pics here is using the Taptalk app.

    Does the relay module unplug from the harness so it can be shipped for repairs?

  7. #7
    Club Member JeffB's Avatar
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    Yes it will unplug for shipping.

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    Club Member mustangmike6996's Avatar
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    I ran across this thread on a different forum:

    https://thefactoryfiveforum.com/show...the-road-again!

    I cannot find your relay anywhere, they have been obsolete for 5 years. The repair that they did in that forum was to desolder the Air Conditioning relay and move it to a different location on the board (they couldn't locate the relay either.) I don't have any on hand with the same specs.

  9. #9
    Club Member mustangmike6996's Avatar
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    https://www.mouser.com/datasheet/2/3...14-1075658.pdf

    This is the spec sheet for the relay. I'm looking up something that will cross reference with the old part.

  10. #10
    Club Member JeffB's Avatar
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    I did a lot of searching also. I did not see the Factory Five thread but sounds just like my issue. I also could not find a relay. I was wondering about using the AC relay because I do not have AC. I really appreciate your help. Thanks

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