Bad news-good news. I'm ignorant on the operation-but have the schematic.
What I believe to be the microswitch is shown on the ground side of the Shift Lock Solenoid. The MS is shown closed (completing ground path) only when in PARK.
Wiring is Brown from SLS to MS, Black from MS to Connector 139 (4-pin) Pin 4, then Black to ground buss on relay rack.
The SLS plus side gets power via brake pedal switch AND "Relay, P-shift lock".
But at 1st glance, I don't see how said Relay gets picked. Looks like +12v on both sides of coil.???
Any of this help you?
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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