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Technical '66 Chevy K10 ignition help

Discussion in 'The Hokey Ass Message Board' started by Robert Lentz, Oct 23, 2019.

  1. Robert Lentz
    Joined: Oct 16, 2018
    Posts: 3

    Robert Lentz

    Working on a factory 66 K10 and got it running w/ original 327. Put an NV4500 Transmission w/ Advanced Adapter bell housing. Powermaster high speed starter. Starts up and runs great. Problem I'm having is when i switch the ignition off, power is being bumped back to the solenoid and it sends the bendix back into the flywheel, grinding it briefly. I eliminated the ignition switch, hot wired it and it starts just fine. Unplugged the wires and it shut down fine. Bought a brand new ignition switch, installed it and its doing the same thing, throwing the bendix into the flywheel when shutting down. Any ideas what it could be? Thanks
  2. radarsonwheels
    Joined: Dec 15, 2006
    Posts: 191

    from Philly

    Is the alternator feeding the trigger wire? Could the starter need shimming?

    Just ideas- Im a mopar guy so...
    302GMC likes this.
  3. theboss20
    Joined: Dec 30, 2018
    Posts: 171


    The first thing to do is un-plug the alternator wires...not the main battery wire... and then try it...if that works you need an anti-feedback diode for the alternator exciter wire.

    Sent from my iPad using Tapatalk
    BJR, tractorguy and 302GMC like this.
  4. Robert Lentz
    Joined: Oct 16, 2018
    Posts: 3

    Robert Lentz

    Okay thanks for the suggestions. I'll give them a try and report back.
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  5. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,089


    Alternator shouldn't be an issue on that one as it came with one from the factory.
    If the resistor bypass wire was put on the wrong side that may cause a feedback and energise the solenoid after the key is shut off and the engine is still spinning.
    Does the starter have the second R pole on the solenoid ?
    I'd think that most of that style go on electronic ignition cars and trucks that don't have a need for a resistor bypass and if you did hook the bypass up wrong there lies your problem.
    Last edited: Oct 31, 2019
  6. Robert Lentz
    Joined: Oct 16, 2018
    Posts: 3

    Robert Lentz

    Thanks for the suggestions. I tried them and the diode on the exciter wire was the trick. Shuts off as it should. Thanks again
    theboss20 likes this.

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