help!no power to coil
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help!no power to coil

  1. #1
    Senior Member rogerroost's Avatar
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    Default help!no power to coil

    should I have power at the I terminal(to the msd box) all the time with ign. on? Thanx

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    Senior Member rogerroost's Avatar
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    sorry ,on the starter.

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    steelcomp was here
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    There is a terminal on the starter where you'll have 12v only when the solenoid is engaged. Does that answer your question?
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    Senior Member rogerroost's Avatar
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    theres 3 ter. one is big main power ,other is trigger from sol, third is suppose to feed the coil or msd. the starter works ok . I'm trying to figure out why I have no power to the msd?wondering if power should be feed to msd with key on ,engine off

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by rogerroost View Post
    theres 3 ter. one is big main power ,other is trigger from sol, third is suppose to feed the coil or msd. the starter works ok . I'm trying to figure out why I have no power to the msd?wondering if power should be feed to msd with key on ,engine off

    The only thing the I terminal is for is bypassing any sort of ballast device, the power to the ignition box comes straight from the ignition switch (color code is purple)...On an MSD box, the I terminal does not need to be used, but can, it would connect to the positive terminal on the coil, it';s job is to "full voltage" the coil upon cranking only, it drops out once the starter is disengaged....And yes, you should be able to turn the key to "Ign." and see 12V at the ignition box...

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    Senior Member rogerroost's Avatar
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  9. #7
    Gone
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    That would only power the coil while cranking.

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    Senior Member rogerroost's Avatar
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    the wiring in this boat is kind of funky.it's done with ALL blk wiring my msd is a 6450 obsolet box,however it worked last yr.
    so there is main + - from batt, orange to + on coil, red (from starter ),a 2 wire harness to dist.,bl to - on coil,wh was'nt hooked up.
    we jumped the red striaght to the batt.still no power to orange

  11. #9
    steelcomp was here
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    At the risk of being redundant, you should have two red wires on the MSD. One large red wire...goes straight to the battery, the smaller red wire goes to a switched 12v source. Your ignition switch, the key, whatever you use to activate the ignition. As Fiat pointed out, the diagram would only have 12v to the coil while cranking. Just ignore the solenoid, and make sure you have a good ground, preferably to the battery.
    Last edited by scott foxwell; 01-10-2010 at 07:12 PM.
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    Just Me snoc653's Avatar
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    The wiring diagram posted shows only the start circuit. There should be a wire from the run terminal of the ignition switch that also goes to the coil. This wire traditionally has a resistor in it as to prolong the life of the coil. In the non-racing world they don't run full voltage to the coil except during starting.

  13. #11
    Senior Member Ronboats's Avatar
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    Default orange to+ black to-

    Does this help any?
    Also, in the wiring diagram you posted, the coil wire should connect to the solinoid, not the starter.That is, if it's a ford,
    So what is it, a chevy with a ford solinoid wired in? you have two solinoids in that diagram...
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    Last edited by Ronboats; 01-10-2010 at 07:27 PM.

  14. #12
    steelcomp was here
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    Quote Originally Posted by Ronboats View Post
    Does this help any?
    Orange to + ...fixed my above post. Thanks.
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    Senior Member Ronboats's Avatar
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    Quote Originally Posted by steelcomp View Post
    Orange to + ...fixed my above post. Thanks.
    Knew I saved that paperwork for something!

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    Senior Member rogerroost's Avatar
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    the boat is a 460 ford. the starter is as the pic shows . it has a sol.at the top of the bellhousing below the junction bar(for lack of proper term) & a sol on the starter.
    The thing is ,it worked last yr wirded this way.I haven't changed any wiring.I agree that the msd diagrams (for a 6al,not what I have)show the red wire to the ignition.perhaps the box is just bad,it's obsolite like 15 yrs ago!

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