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Subject: front mount coil voltage

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Ed    Posted 10-22-2019 at 07:26:29 [URL] [DELETE]        [Reply] [No Email]  
  • front mount coil voltage
  • Hello I have a 49 8n that was converted to 12 volt, I keep burning up coils and points. What is the correct way to check and adjust the voltage? to the coil ?

    Thanks ED

    Tim Daley(MI)    Posted 10-22-2019 at 10:17:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: front mount coil voltage
  • A '49 would indicate a front mount distributor, that is more important to know than a model year or a serial number. So, using JMOR's fine document on wiring, find your setup and follow it to a T -no shortcuts allowed. Do you have the Ballast Resistor? Is the Voltage Regulator still in the circuit? It shouldn't be if using 12V. There is no voltage adjustment. You set up the system for whatever you are using (6V/POS GRN or 12V/NEG GRN)and that's it. With a 6V Coil you need to add an inline ceramic 1-OHM resistor. Best to buy a 12V coil and do away with the external resistor altogether.


    tpd

    Tim Daley(MI)    Posted 10-22-2019 at 10:43:13 [URL] [DELETE]        [Reply] [No Email]  
  • RESISTORS
  • These pictures may help...

    FORD OEM BALLAST RESISTOR -USED ONLY WITH FRONT MOUNT DISTRIBUTOR:

    HELP: The LH resistor Terminal Post connects to the COIL Stud Terminal Post as you face the back off dash.

    EXTERNAL 1-OHM CERAMIC RESISTOR - USED ON FRONT MOUNT ONLY AND ONLY IF COIL IS 6V:


    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

    Tim Daley(MI)

    Farmer Dan    Posted 10-22-2019 at 09:44:00 [URL] [DELETE]        [Reply] [Email]  
  • Re: front mount coil voltage
  • Sounds to me like something is wired wrong. Try checking it against this diagram:

    Or like Bruce said you may be leaving the key on.

    Bruce (VA)    Posted 10-22-2019 at 08:39:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: front mount coil voltage
  • You check the voltage with a volt meter.

    As Den said, you must use the oem ballast resistor even with a 12v front coil. See tip # 30.

    But...


    Plenty of folks get many hours of operation w/o one, so I suspect you have other problems. Like leaving the key on.

    K.LaRue-VA    Posted 10-22-2019 at 13:31:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: front mount coil voltage
  • I think Bruce hit the nail. When the points are also burned up that seems to indicate the key was left on long enough to cook the points and the coil.

    KL

    Den N Ms    Posted 10-22-2019 at 08:15:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: front mount coil voltage
  • Ed,You MUST use the OEM ballast resister even with a 12 volt coil.

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