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Ford 9N

H

Harold C

New User
Resistor issue:
I have power at the terminal coming from ignition switch but no power at the terminal for the wire going to coil. What is wrong? What is the resistor for?
 
No power to the coil? Need to know if your tractor is still 6 volt or if it's been converted to 12 volts. Best place to start is Bruce's tips. Great resource to trouble shoot N tractor problems.
Bruces 75 tips
 
an ignition resistor is used to lower the voltage supplied to the coil while running. This allows a coil with a lower voltage design to be used for running, while a separate wire is used to supply full voltage during cranking with the starter motor. The cranking motor draws enough amps to lower the battery voltage to 4.5 or so. the bypass thus allows hot spark for starting at that lowered bat voltage. If the wire is bad, a 1.5 ohm 40 watt power resistor could be used instead with plain 12ga copper wire to the switch. Ford used a resistor wire in many vehicles including cars into the 70s. Jim
 
On the N series Ford that is a thermistor which as it get hotter the resistance goes up so that the coil which is likes to get hot and burn out will last a lot longer. Is you may have a burned out thermistor. Jumper across it and see it it runs if it does then it is bad and you need to replace it. If it does not then hot wire it and see if it runs so you know if the problem is in the distributor or the wiring
 
GOOD comments, except about the starting bypass in a 9N Ford discussion. They didn't have one. They used a PTC resistor, so it initially would have less voltage drop for hotter spark during cranking, then, as the resistor heated up it's resistance increased, dropping the voltage to the coil during normal operation.
 
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