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Results 1 to 7 of 7
  1. #1
    Join Date
    Aug 2007
    Location
    Newport Beach, CA, USA
    Posts
    14

    Default 1987 454's. Anyone know th

    1987 454's. Anyone know the purpose of the coil ballast resistor. I've blown one on each engine now. Engine will start and run as long as key is held in start position. Release key -- engine stalls. In an emergency will it do damage to wire around the resistor?

  2. #2
    Join Date
    May 2006
    Location
    pensacola, fl., u.s.a.
    Posts
    1,366

    Default "it will fry the points, but g

    "it will fry the points, but get you home. the ballast lowers the voltage at the coil. it is bypassed while cranking. main reason it is there is to preserve the points. keeps them from arcing. the higher voltage will also make the coil run hot, and shorten its life."

  3. #3
    Join Date
    Aug 2007
    Location
    Newport Beach, CA, USA
    Posts
    14

    Default "Thanks for the reply and info

    "Thanks for the reply and info. Oddly enough the ignition sys had been changed to electronic ignition in 1999, before I owned the boat. My mechanic said that elec ign usually eliminates the coil resistor. I blew the stbd one about 6 miles out of Newport Beach on my way to Catalina Island. Fortunately it had happened to the port engine a few years earlier and I had bought a spare. Just curious how far I could run with a bypass before damage."

  4. #4
    Join Date
    May 2006
    Location
    pensacola, fl., u.s.a.
    Posts
    1,366

    Default "change the coils, eliminate t

    "change the coils, eliminate the resistor, and have fun on Catalina."

  5. #5
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    12,510

    Default "Scott is right on! Buy a cou

    "Scott is right on! Buy a couple of TWELVE VOLT coils and toss the ballast resistors in the can. Just jumper right across the in and out connections.

    Ballast resistor circuits was a dumb, '60s idea that should have been toissed out from the beginning.

    Jeff"

  6. #6
    Join Date
    Aug 2007
    Location
    Newport Beach, CA, USA
    Posts
    14

    Default Thanks for the great replys gu

    Thanks for the great replys guys. If I hadn't already blown a resistor on the other engine I would still be scratching my head. BTW Catalina was awesome. 8 perfect days.

    How do I know which coils to use??

  7. #7
    Join Date
    Sep 2007
    Location
    Fairfield, Calif., USA
    Posts
    11

    Default Usually Ballast coils are mark

    Usually Ballast coils are marked use with external Resistor and non ballast coils are not marked ar say has internal resistor.
    Hope that answers your queston

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