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Technical What Coil for 8ba

Discussion in 'Traditional Customs' started by Big_Red, Apr 25, 2024.

  1. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    Hi!
    Ok, embarrassing. Was troubleshooting my wiring Sunday and after not finding the problem I accidentally left the ignition on :( burned up the coil. I was standing out there still and heard the popping and saw the smoke start pouring out. Disconnect everything quick (snips) l

    so my question, does it matter what coil I buy? This one didn’t really have any markings. Just a black coil. Completely original engine, upgraded to 12v w 3 wire alternator (previous owner).

    what do I check in the distributor other than filing the points.

    thanks guys. And feel free to roast me if you want. :DRed
     
  2. alchemy
    Joined: Sep 27, 2002
    Posts: 20,550

    alchemy
    Member

    Roast you, like you roast coils?
     
    GordonC and Flathead Dave like this.
  3. Oneball
    Joined: Jul 30, 2023
    Posts: 730

    Oneball
    Member

    Do you have a ballast resistor or not?
     
  4. 51504bat
    Joined: May 22, 2010
    Posts: 4,815

    51504bat
    ALLIANCE MEMBER

    Per Bubba's (RIP) advice I run a Bosch blue coil on my 8ba converted to 12 volts with one of his Chevy distributors.
     
    Budget36 and Mr48chev like this.

  5. poco
    Joined: Feb 9, 2009
    Posts: 1,244

    poco
    Member
    from oklahoma

    Just any 12 volt coil
     
  6. 51504bat
    Joined: May 22, 2010
    Posts: 4,815

    51504bat
    ALLIANCE MEMBER

    Can't help you with HEI. Mine is a point unit.
     
  7. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    How would I tell if it is a ballast resistor? Or HEI? My knowledge is 1 year if automotive 30some years ago and picking things up here and there. I’ve made a couple sets of custom plug wires, replaced the coils in two modern vehicles. but weirdly enough never seen inside a distributor cap.

    red
     
  8. ClarkH
    Joined: Jul 21, 2010
    Posts: 1,427

    ClarkH
    ALLIANCE MEMBER

    Typical ballast resistor is a white ceramic rectangle, ~2"-3" long.
    sum-g5218_xl.jpg
     
    Budget36 likes this.
  9. bushwacker 57
    Joined: Oct 3, 2007
    Posts: 647

    bushwacker 57
    Member

    BOSCH Blue 12v Internal Restistor VW.
     
  10. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    Oh, where in the wiring would the resistor show up? I have something on my fender that has 4 wires attached to it. But other than that I don’t think I have one.
     
  11. wheeldog57
    Joined: Dec 6, 2013
    Posts: 3,197

    wheeldog57
    Member

    The unit with the 4 wires on it is likely the starter solenoid. Ballast resistor is usually mounted on the firewall. Filing the points may not be enough, I would buy new ones
    Good luck and keep us posted
     
  12. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 964

    Glenn Thoreson
    Member
    from SW Wyoming

    Any universal 12 volt coil from your friendly neighborhood parts store. You can eliminate the ballast resistor by buying a coil with an internal resistor. With external resistor - hot wire from the ign switch goes on one end of the resistor and wire to the coil on the other end then to the distributor. Internal resistor - hot wire direct to the coil. On a 12 volt system, the hot wire goes to the + side of the coil. the distributor is the ground. ( - ) Post a picture here, please, so we can confirm.
     
    Toms Dogs likes this.
  13. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    Hi guys,

    I have a wire from under the dash, I think wired to the starter button or maybe the fuse panel. Can’t remember even though I wired it. Then another wire goes from there to the bottom of the distributor. Looks like this
     

    Attached Files:

  14. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    Regarding points I know I can find a video in replacing them but are they universal do I need to find a way to id the distributor
     
  15. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    Shoot. Cool says “external resistor” but you all see how the wires are. Could there be a resistor somewhere in my new fuse panel (rebel 9+3 kit).
     

    Attached Files:

  16. TrailerTrashToo
    Joined: Jun 20, 2018
    Posts: 1,295

    TrailerTrashToo
    Member

    Not likely - Take a look at the picture in post #8 above. The resistor is a relatively large device and produces a lot of heat - hence the ceramic case around the resistive element.

    Also - Take a good look at the condition of the points in the resistor - There is a strong chance that the contacts are burned.

    Russ
     
    Budget36 likes this.
  17. Big_Red
    Joined: May 6, 2011
    Posts: 30

    Big_Red
    Member
    from Fresno, CA

    I will look again but couldn’t find the resistor before. I swear guys. Can a system run without it?
    I can’t figure out how to remove the rotor, which Napa suggested I replace. But I did get the point off. They say fd808ixv on em which I guess is a model. But to my untrained eye they look ok. They were burned together.
    Sorry guys I do know someone local I can ask for help, but im trying to avoid my brother, it’s Our car, from knowing since it’s embarrassing

    the rotor says fa67, I don’t mind spending the money If I should replace it too. But again, I couldn’t see a screw to remove it
     

    Attached Files:

  18. Budget36
    Joined: Nov 29, 2014
    Posts: 13,319

    Budget36
    Member

    The rotor should pull straight up and out.
    You will have to set the points gap with feeler gauges, or use a dwell meter. Both ways require the specs needed to set and adjust.
    Curious. What engine is it?

    Also, if points and a coil, it should require a ballast resistor if 12 volts.

    Well, assuming you have a 1.5 ohm coil.
     
  19. TrailerTrashToo
    Joined: Jun 20, 2018
    Posts: 1,295

    TrailerTrashToo
    Member

    Yes, the engine will run {for a while} with out a resistor {NOTE: We are still talking about an ignition coil with a "USE EXTERNAL RESISTOR" warning}. The "EXTERNAL RESISTOR" limits the current through the ignition points and the ignition coil. Without this resistor, both will burn up due to the high current {high current causes more heat}.

    Russ
     
  20. BJR
    Joined: Mar 11, 2005
    Posts: 9,941

    BJR
    Member

    Look on the inside of the firewall in the passenger compartment for the resistor. It may be behind the dash somewhere.
     

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