Farmall 140 electrical

OB OBrien · Oct 3, 2010

Another question about farmall wiring. Have a 1956 Farmall 140 with a 12 volt system. Found a wire behind the instrument panel that was disconnected. According to the wiring diagram its labeled number 10 and should be connected between the "L" terminal of the voltage regulator and a terminal on the light switch. My question is what does the term "L" stand for? Is it load or light?
Thanks for the help.
OB.

Janicholson · Oct 3, 2010

Good question. I believe it is Load. The internal workings of a four terminal Delco regulator of that type send generator output directly to the Devices attached to it. Including lights, but in other applications, it could include radios or other "loads". This allows a more controlled charge rate to the battery (according to theory) while providing less drop off of current to loads. Alternators, make use of a similar control concept by taking a sensor (voltage) reading on the #2 terminal from close to the battery. Avoiding voltage drop from the battery through the main output wire.
Jim.

Farmall 140 electrical

OB OBrien

Member

Janicholson

Well-known Member

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