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Ford Mustang: OT: marine 454 no spark from coil

  1. #1
    Simon
    Guest

    OT: marine 454 no spark from coil

    sorry for the cross post.

    A friends got an old speed boat (think 70's classic style speed boat)
    with a 454. He's been working on it recently and had the engine out.
    After putting it back in and hooking up all the wires the way they were
    before (known working). It wont spark... No spark coming out of the coil
    when the wire is held near the block, and the engine turned over.

    He's replaced the coil, and condenser, and we've tried changing ground
    points, and making sure all the wiring is connected and more or less
    sound. There isn't a WHOLE lot of wiring to this thing. At one point we
    had the key in the on position while working on something and the new
    coil was pretty hot, so we thought we might have had the wires on the
    coil reversed, after switching them the coil went back to just being warm.

    Then we did some informal circuit testing (read: looked for some spark
    when grounding the wires that go to the coil terminals) the coil is most
    definitely getting current (spark from the negative wires when touching
    them to the block, spark from the positives when touching them to the
    positive coil terminal), but nothing is coming out of it where it matters

    Anyway what are some likely candidates? Bad ground somewhere is my
    guess... two bad coils and/or two bad condensers doesn't seem likely.
    Current isn't getting to the distributor if the coil isn't sending it so
    that's out of the troubleshooting loop right? The starter certainly is
    getting current (turns the engine just fine) and there's a little
    solenoid (not the starter solenoid) that is in the circuit between the
    key and the coil... this could be bad, but then if it's the problem why
    is the coil getting current when the key is on?

    Any thoughts much appreciated.


  2. #2
    c
    Guest

    Re: marine 454 no spark from coil


    "Simon Juncal" <com> wrote in message
    news:com... 
     

    Does it have a ballast resistor in the ignition circuit? Some of them have a
    start circuit and a run circuit. These resistors will have 4 terminals on
    them. That's what it sounds like to me.

    Chris



  3. #3
    Backyard
    Guest

    Re: OT: marine 454 no spark from coil


    If the coil is heating up, that means there's current going through it.

    Use a meter or test light (to grd) at the neg side of the coil as you open
    and close points.

    if you never see 8 - 12 volts to ground, and there's only the wire to the
    dist hooked up there, then something in the dist is shorted.


    12V - - ballast res -- coil pos| coil neg - - dist points/condenser- - grd
    | - - start sol- - |


 

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