There are several ways to activate the switch pitch other than the stock setup which is a small micro switch on the throttle linkage nearest the firewall.
The sp lug on the trans is the horizontal or top lug. Putting 12 volts on this lug will energize the sp solenoid and put the converter in hi stall. Removing the 12 volts will return the converter to the lo stall or driving mode.
A popular way to approach this is to use the brake light circuit as your 12 volt source. Step on the brake and you apply 12 volts to the sp solenoid. Sometimes this is not the best setup, especially in mountainous terrain, so folks use a 3 position toggle switch to control when power will be available to the solenoid. "Normal operation on" position and the brake light circuit is the power source. "Toggle switch off" or center position and no power goes to the solenoid regardless of brake pedal position. The third position can be used to apply power to the solenoid manually so the solenoid is powered until the switch is moved to a different position, again regardless of brake pedal position.
Hope this helps.
Mike
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