Farmall 140, Ideal resistor for 12v-6v coil.

PretendFarmer · Oct 16, 2013

I am in the process of properly converting to a 12 volt system on my 140 but leaving the 6 volt coil in there because I have a couple kicking around that I will use up before buying any.
I have two questions:
1. What is the ideal resistor part number from NAPA?
2. I have a marine alternator. It has one lug and a two prong plug on it. Anyone know what i need to do with the two prong plug?
Thanks for any help.

JDemaris · Oct 16, 2013

NAPA ICR13 resistor will work fine.

Wiring that alternator depends if you are using an
idiot light or a amp gauge. I assume you are using a
Delco CS series and NOT an SI?

mkirsch · Oct 16, 2013

Treat the two-prong plug the same as the two-prong plug on a standard Delco 10SI alternator.

There's an excite circuit and a voltage sensing circuit. On a 10SI, terminal #1 is the excite, and #2 is the sensing. You would connect the #1 to the ignition switch through a diode, and connect the #2 back to the large BAT lug.

The challenge is in determining if #1 = #1 and #2 = #2 on this marine alternator of yours. They could be labeled "F" for field, and "S" for sense. Field is the excite circuit.

PretendFarmer · Oct 16, 2013

(quoted from post at 13:05:18 10/16/13) Treat the two-prong plug the same as the two-prong plug on a standard Delco 10SI alternator.

There's an excite circuit and a voltage sensing circuit. On a 10SI, terminal #1 is the excite, and #2 is the sensing. You would connect the #1 to the ignition switch through a diode, and connect the #2 back to the large BAT lug.

The challenge is in determining if #1 = #1 and #2 = #2 on this marine alternator of yours. They could be labeled "F" for field, and "S" for sense. Field is the excite circuit.

So will I be running a wire from the BAT lug to the battery? Or the only wire leaving the alternator would be from the #1?

Bob M · Oct 16, 2013

The aux terminals may also be labeled "lamp" (equivalent to #1 and F) and "sense" (equiv to #2 and S)

HydroTek · Oct 18, 2013

So will I be running a wire from the BAT lug to the battery? Or the only wire leaving the alternator would be from the #1?

The wire from the lug will goto the battery via the amp gauge ..the wires from the #1 and #2 terminal will go as "mkirsch" stated. Can we assume the picture of the alternator is not the one you are using?

Farmall 140, Ideal resistor for 12v-6v coil.

PretendFarmer

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JDemaris

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mkirsch

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PretendFarmer

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Bob M

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HydroTek

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