resister on 9n

glenn carpenter · Apr 25, 2022

what is the purpose of the resister between the starter switch and the distriutor on a Ford 9N and what should the ohm reading be?

old · Apr 25, 2022

Don't you mean ignition switch and coil?? It is there to drop the voltage down a bit to keep the points and coil from burning out. It is a thermister which as it gets warmer the resistance goes up some

miner09 · Apr 25, 2022

It's for use of a coil that doesn't have a internal resister. And you can use a 12 battery on a 6 volt coil with a inline resister.

jimtrs · Apr 25, 2022

(quoted from post at 19:00:43 04/25/22) It's for use of a coil that doesn't have a internal resister. And you can use a 12 battery on a 6 volt coil with a inline resister.

On the old Ford 9N, 2N, and 8Ns with front mounted distributors and coils, the OEM ballast resistor is needed when running a 6 volt system. As old said, it reduces current to the somewhat fragile front mount coil. I believe the ballast resistor is around 1.0 ohm cold, and increases to about 1.7 ohms when hot.

You want this original style ballast resistor on the tractors mentioned above, with front mounted distributors and coils.

A 12 volt conversion on these same tractors would require an additional resistor if keeping the 6 volt coil. There are 12 volt front mount coils that would not need the additional resistor, but would still use the ballast resistor.

Geo-TH,In · Apr 26, 2022

A thermistor is a type of resistor whose resistance is strongly dependent on temperature, more so than in standard resistors. The word thermistor is a portmanteau of thermal and resistor.

Thermistors are divided based on their conduction model. Negative Temperature Coefficient (NTC) thermistors have less resistance at higher temperatures, while Positive Temperature Coefficient (PTC) thermistors have more resistance at higher temperatures.[1] Hence, a PTC thermistor's resistance is directly proportional to temperature.

NTC thermistor are widely used as inrush current limiters, temperature sensors, while PTC thermistors are used as self-resetting overcurrent protectors, and self-regulating heating elements. An operational temperature range of a thermistor is dependent on the probe type and is typically between 100 C and 300 C (148 F and 572 F)

JMOR · Apr 26, 2022

(quoted from post at 18:27:47 04/25/22) what is the purpose of the resister between the starter switch and the distriutor on a Ford 9N and what should the ohm reading be?

o far, every responder has said that it is something that does not fit the description that you gave in your posted question. Your description may be lacking or their responses may be answering a question that you didn't ask? Can you further clarify the resistor and its connections and add additional information as to the connection of the dash mounted 3- terminal block & resistor?

resister on 9n

glenn carpenter

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old

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miner09

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jimtrs

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Geo-TH,In

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JMOR

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