FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Coil and distributor

    • 1 of 1

       

    2/13/2021 12:09 PM  #1

    docsmith
    FYI FORD Member

    Offline

    Registered: 8/10/2018
    Posts: 16

    Coil and distributor

    I installed a new jegs 2 wire electronic ignition in the cap.  Wired the distributor to the coil and walked away.  Accidentally left ignition on.  The coil smoked.  Red wire to pos black to neg.  what could cause this?  The old set up was 3 wire one was brown,what was the brown wire?

     

    2/13/2021 2:42 PM  #2

    wsinsle
    Senior 24-7 FYI Addict

    Offline

    From: Belle Vernon, PA
    Registered: 4/01/2013
    Posts: 1,703

    Re: Coil and distributor

    A few months back I was working on the car. Left the garage with the ignition on. 3 days later I had a burnt up coil and dura spark ignition. These parts are not designed to have steady voltage on. When the car is running voltage pulses to the coil. With the ignition on and the engine not running, if the points are closed (or what ever you are using) the coil gets steady voltage. Eventually they over heat and burn up. Not sure about your brown wire, what did you have before. Points or something else?

    If this forum can't fix it, it isn't broke.
     

    2/13/2021 3:19 PM  #3

    docsmith
    FYI FORD Member

    Offline

    Registered: 8/10/2018
    Posts: 16

    Re: Coil and distributor

    It had Petronix aftermarket ignition.  I hope I didn’t burn up the ignition.  I ordered a new coil.  Fingers crossed.  

       •Thread Starter
     

    2/13/2021 4:31 PM  #4

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,853

    Re: Coil and distributor

    Why not just switch to a duraspark distrib????... pre 1985 for carb'ed engine.......
    Bet it's cheaper than Jegs stuff and near-bout bullet-proof!
    Just do away with the points activated "protronics" stuff.
    Unless UR racing  just go with FoMoCo stuff. Good to 6000 RPM 'all-day-long'!!
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    2/13/2021 6:38 PM  #5

    RV6
    Senior 24-7 FYI Addict

    Offline

    From: Pine Junction, CO
    Registered: 3/01/2016
    Posts: 1,248

    Re: Coil and distributor

    Yup, the only way to cook a coil is by leaving the ignition ON and the points, or electronic trigger, closed. 

    Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
     

    2/14/2021 8:41 AM  #6

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,499

    Re: Coil and distributor

    You almost certainly smoked the Pertonix.  I sadly know from experience.  They get really hot in a short period of time KOEO and cook.  The case is probably a little distorted, clearly showing heat damage.  I have my old failed one around somewhere. 

     

    2/14/2021 9:25 AM  #7

    BobE
    Senior 24-7 FYI Addict

    Offline

    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,645

    Re: Coil and distributor

    Docsmith - not sure what year car you have, but on 65-66 Mustangs, the "brown" wire is the 'full voltage' supply from the starter solenoid (this is only used when starting).  On 65-66 cars, this wire is connected into the firewall bulkhead connector in the center of the firewall.  Once the starter solenoid is released, coil voltage is supplied from the ignition switch via the 'pink' resistor wire.  
    The coil can be checked with an ohmmeter, + post to - post (outboard terminals) should be about 0.8ohms.  Either outboard post to center post should be about 10,000-12,000 ohms. 
    Hope this helps.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    2/14/2021 10:52 AM  #8

    docsmith
    FYI FORD Member

    Offline

    Registered: 8/10/2018
    Posts: 16

    Re: Coil and distributor

    That helps a lot about the brown wire. And yes I have a 65 289 covert.  
    so once I cut the brown wire from the Petronix electronic point replacement where should it be wired to? The firewall end was never disconected it the coil end disconnected. 


    thx

       •Thread Starter
     

    2/14/2021 11:42 AM  #9

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,499

    Re: Coil and distributor

    I wired mine so the coil gets 12V and the Pertronix is wired right to the coil and also gets 12V keyed power.  Some guys have used a relay to power the coil, removing the high amp load from the 12V source.  Relays can be switched via low amperage draw 12V, or even switched via ground (most modern cars electronics are ground switched now). 

     

    2/15/2021 10:06 AM  #10

    BobE
    Senior 24-7 FYI Addict

    Offline

    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,645

    Re: Coil and distributor

    docsmith wrote:

    That helps a lot about the brown wire. And yes I have a 65 289 covert.  
    so once I cut the brown wire from the Petronix electronic point replacement where should it be wired to? The firewall end was never disconected it the coil end disconnected.
    thx

    I can't help with this as I'm not sure if the Petronix needs full 12v constantly, or if the resister wire still needs to be in the circuit after the engine is running.
     

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    2/15/2021 2:26 PM  #11

    TKOPerformance
    Hyper FYIFORD ADDICT

    Offline

    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,499

    Re: Coil and distributor

    Runs fine on full 12V.  Mine's been like that for 8 years now with no issues. 

     

     

    1 of 1

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  Coil and distributor

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.