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Thread: Smart Coil Sub-Harness 558-312

  1. Default Smart Coil Sub-Harness 558-312

    I'm just going over some wiring in my car and tidying up. I just want to clarify that the Sub-Harness 558-312 Pin "E" is supposed to be connected to a switched +12V source, and not a Crank/Run +12V source correct?
    '84 Ford Mustang

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    17,655

    Default

    Yes, switched power in crank & run key positions. The ignition coils must be powered to start the engine.
    http://documents.holley.com/199r10698rev1.pdf (Holley 558-312 CNP Coil Sub-Harness Instructions)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. Default

    OK thanks. Just trying to determine why my key in ignition is so hit or miss when trying to start the car. Like it would just click and then the odd time it would actually engage. I already replaced tumbler/ignition switch, so it must be wiring related I guessing. Going to replace the wire to starter (Powermaster starter with no factory solenoid). I've already driven the car, etc., it's just the damn key in ignition starting that's acting up.

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