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I'm in the process of addinmg the engine wiring harness. The two leads in the harness that go to the starter. One goes with the positive on the solenoid, the other lead, does it go to the R or S on the solenoid.
 

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Pontiac generally uses the "S" terminal on the solenoid to activate the starter. As I recall, the "R" wire in some applications runs 12 volts to the coil for starting purposes when cranking the engine and disconnects power once you snap back the key to the "Run" position with engine now running. A couple of forum posters have experienced this using just the "R" terminal to run 12V to an HEI or aftermarket electronic ignition as the engine will catch, and then shut down as soon as you let the key off. The "R" terminal does not produce a steady 12V - it only does so when you try and start the engine.

FYI - Pontiac points type distributors use 2 wires going to the coil. One wire provides 12volts when cranking the engine to provide a faster start and then a resistor wire takes over once the engine is running so as not to burn up the points.
 
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