86 chev pu TCC control

bought an 86 pu, 3 speed auto, and it has a tcc control, and the wires are NOT hooked up at all anywhere, so i would like to just use a toggle switch to turn the solenoid on and off, my question is which wires do what, there
are three wires, one must be the ground, 12 volt power and the third one i am not sure.
does anyone know here??

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