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HubbardRA

Idiot Light

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HubbardRA
Does anyone have a wiring diagram that shows how to wire a light to indicate discharge on one of the starter/generator setups? I had the diagram at one time, but can't seem to find it. I want to put a charge light on my AC712S project tractor.

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PatRarick
You need a two wire light, NOT externally grounded. On wire goes to the accessory terminal of the ignition switch, the other to the ARM or GEN terminal of the regulator or starter/generator. The easiest explanation is that the ARM terminal is the ground for the light until the generator starts charging. When charging starts, you have a live wire to both sides of the lamp, so the lamp goes out. Pat

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PhanDad
My Homelite T12 wiring diagram confirms Pat's answer. Per the diagram, the light is wired between the middle terminal of the starter/generator's voltage regulator (assume this is the "arm" terminal, don't have my tractor here to confirm) and the key switch.

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HubbardRA
Thanks Pat, I knew the voltage balance theory, but just couldn't remember the specific connections to pick up the control voltages. Still trying to get the actual hookup and function of starter/generators straight in my mind. Been playing with cars since a kid, but these units are still a little fuzzy to me, even after reading Al's write-ups.

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