It mounts to the starter.. one big terminal faces the front of the tractor.. one big terminal faces the back of the tractor.. the small terminal faces the engine.. in fact... it is so close it is hard to get a tool in there to take the nut off. Power from the battery connects to the terminal towards the rear of the tractor. The terminal towards the front of the tractor connects to the copper buss bar strip over to the starter post. The big thumb switch wire connects to that small third terminal... all there is to it.

The thumb switch wire is simply switched ground.

If you want to do some meter readings.. hook up power to the big rear terminal.. use your vom and see if you measure power on the small third terminal ( you should ) if so.. you are hooked up correctly.. and grounding that small terminal should make the solenoid close, and then you should be able to read power on the front terminal that passes power to the starter.

If it is not an oem 3 terminal solenoid... that info above may not apply.

If it is a gm alternator that conforms to the
10-Si specs we use.. then.. if it is a 3 wire job:
P1 is isolated/switched excite.

That is.. you are providing power to start the initial charging. A momentary toggle switch from this terminal to + will work, or a marker lamp in line with this terminal, then hooked to the switched side of the ignition switch should work.. You could also substitute a correctly sized diode in place of the marker lamp ( oriented correctly ).. or even an automotive style ignition switch could be used.. and hooking P1 to a contact seperate from the ignition.. like a accy position that is powered when the ignition is on.. but off when the ignition is off.

P2 is hooked right down to the output stud.. this is the sensing line for the VR.

Soundguy

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