1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Re: Ballast Resistor

Discussion in '40- & 55-Series Tech' started by oxpitot, Jun 21, 2003.

  1. oxpitot

    oxpitot

    Messages:
    2
    Likes Received:
    0
    Joined:
    Apr 9, 2003
    Location:
    Ontario
    I went through something like that with my 71 FJ40. It has an internal resistor in the coil. When I first got it running it would burn up the points within about 15 minutes (rough running, then backfiring, loss of power, then a sudden eerie silence). I was told to use a GM external resistor for trouble shooting, and that worked fine as a temporary measure.

    I think any ballast that drops the voltage to around 8-10 volts across the points will do. Don't try running long without any resistor or you will burn your points, and they are rather annoying to change.
     
  2. thorvald

    thorvald .......

    Messages:
    1,569
    Media:
    19
    Likes Received:
    23
    Joined:
    Aug 18, 2002
    Location:
    on the ice, wyoming
    so a 71 shouldnt need a resistor then? when I did my rewiring I didnt come across one, must be in the coil.
     
  3. toddslater

    toddslater SILVER Star

    Messages:
    1,498
    Likes Received:
    2
    Joined:
    Oct 31, 2002
    Location:
    Kennett Square
    here is a pic of the ballast resistor on my 73. I wasn't aware that the earlier coils had them built in...need to do some digging.
     
    juanchogaviria likes this.
  4. Brog

    Brog

    Messages:
    182
    Likes Received:
    0
    Joined:
    Mar 31, 2003
    Location:
    Chattavegas, TN
    For what it is worth;
    My '67 has an external resistor.
    Brog