Re: 9N coil

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Posted by Tim Daley(MI) on April 28, 2018 at 15:48:25 [URL] [DELETE] :

In Reply to: Re: 9N coil posted by Les Leach on April 28, 2018 at 12:17:58:

LES-
It doesn't sound like you have the original ballast resistor in your circuit. I think you are trying to tell us your coil is 6-volts. If so, you need to use the additional resistor from coil to ballast resistor post as shown in 4th pictogram. The downside to not using the stock OEM Ballast Resistor is just what you are experiencing -nothing. Since you already have a coil and the 'step down' resistor, adding and wiring correctly a ballast resistor would be the cheapest way to go. Going to a 12-volt coil would eliminate the extra 'step down' resistor that we think you have now -see links below. Either way, when using a 6-volt coil or a 12-volt coil, you WILL need the OEM ballast resistor in place. Getting the right components and wiring them correctly are the key elements here. Bear in mind just because the parts were on the tractor when you bought it doesn't mean they are right to begin with. As stated before, go by the wiring schematics in the Operator's and F-04 manuals for original wiring, then add in alternator and extra resistor as needed.

SECONDARY BALLAST RESISTOR USED ON 12-VOLT CONVERSIONS WITH 6-VOLT COIL:
https://www.just8ns.com/8NE10306-Years-1939-64-Voltage-Reducing-Resistor-10-OHMS

OEM BALLAST RESISTOR 39-47:
https://www.just8ns.com/A8NN12250B-Years-1939-47-Resistor-And-Mounting-Block-Assembly

Tim Daley(MI)


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