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Thread: MIL Light

  1. #1
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    MIL Light

    I can not find the wires labeled MIL on the schematic. Is it a light indicator? It has an IGN SW wire in loom with it.

  2. #2
    Papa's Avatar
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    Are you installing a Coyote engine? If so, the MIL is the Malfunction Indicator Light. This thread may help: https://thefactoryfiveforum.com/show...ur-MIL-Working
    My Build Thread: http://thefactoryfiveforum.com/showt...ter-Build-9754
    (Most viewed Roadster build thread on this forum!)

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  3. #3
    Senior Member Fixit's Avatar
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    The MIL (and the OBDII socket) come with the engine wiring harness from Ford Performance - along with the computer and engine bay fusebox. It's not a part of the Ron Francis harness.
    John D. - Minneapolis 'Burbs

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  4. #4
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    Thanks Guys

    Quote Originally Posted by Fixit View Post
    The MIL (and the OBDII socket) come with the engine wiring harness from Ford Performance - along with the computer and engine bay fusebox. It's not a part of the Ron Francis harness.
    Thanks for the explanation. I have LS3. I wonder if there is any possibility of making it work? Will continue to research.

  5. #5
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    60's kid, I'll be checking out the MIL on my LS3 very soon. Will update that on my LS3 tach post.

  6. #6
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    Mine works.
    If you have the GM tranny and engine ECM there is a bulkhead 12 pin connector that connects both together. The "B" pin has a brown/white wire that is the one to use for the dash mounted MIL light.
    If your using an LED you'll need a resistor in series with the LED, I used a 1K ohm.

  7. #7
    Senior Member HVACMAN's Avatar
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    Quote Originally Posted by 60's Kid View Post
    I can not find the wires labeled MIL on the schematic. Is it a light indicator? It has an IGN SW wire in loom with it.
    For the LS3, If you use the CAN-Bus gauges from Speedhut the speedometer has the MIL light, turn signals, and high beam indicator lights all built in. Plus no sending units to worry with and it plugs directly into the OBD II connector.
    33 Hot Rod (Gen 1) Stage 1 delivered on 4/27/2017, Stage 2 delivered on 9/21/2018
    LS3 495hp/480 lb. ft., 4L70E, Electric PS, Classic Auto Air, Lokar electronic sport shifter, 13 inch Wilwood front and 11.68 Cobra rear brakes, Ford 8.8 w 3.73 w 4 link, Billet Specialty Legend Series MAG wheels and Mickey Thompson
    Sportsman S/R 26x8x18 front and 29x18x20 rear tires.

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