Automatic Neutral Safety Switch

[Ronno6]

When I removed my steering column to install the clutch pedal setup in my 84 C10, I of course had to disconnect all wiring from the column.
I have identified the wiring for the neutral safety switch, but cannot for the life of me determine from where I disconnected it.
The manual calls the backup light switch to also be the neutral switch, but there isn't anywhere to connect the harness plug.
Nowhere......... 2 contacts only for the backup lights, verified by ohmmeter.
I have read other posts regarding this but have never seen a resolution.
Pictures I have found online show NSS wires just plugged onto slots on the switch.
My switch has these slots but there are no contacts inside.
It is the only switch which rotates with the shift lever.
Puzzling.
Fortunately, as I am changing to a manual tranny, I know where the wires connect.
I would still like to know where they were connected in the automatic setup..........

[Ronno6]

The answer to my question is that there IS no neutral safety switch in an 84 C10.
The ignition switch is mechanically blocked from turning to "start" when the shift lever is not in Park or Neutral...

So, how do I wire to the clutch switch and disable the current system??

[VileZambonie]

Just like the factory did, Yellow wire to ignition switch goes to clutch safety switch, purple wire goes from safety switch to S terminal on starter solenoid.

[VileZambonie]

this should help you

[Ronno6]

I have identified the purple and yellow wires shown in the diagram.
They are on a plug which is not connected to anything in the auto trans setup.
they have no function in the current circuit.
The starter will engage without these wires being connected to anything.
This being the case, I would have to believe that something must be taken out of the current circuitry in order for the
purple and yellow sires to be connected to the clutch switch and actually become functional.
If these wired had been connected to a neutral switch, I could understand unplugging from that switch and connected to the clutch switch. But, as they are currently not connected and the starter works just fine, I am at a loss.

[Ronno6]

First, the disclaimer: The markings on this diagram are NOT mine; it is as found on the web.

This drawing shows the wires on the blue ignition switch plug:

I would think the NSS to be wired into the indicated purple wire, closing the circuit when the pedal is depressed.
But, as the harness has the yellow and purple wires in an unused plug, I still don't get how things should function.

[VileZambonie]

Someone bypassed it and ran a direct run to the starter solenoid is what it sounds like. That connector should be connected to the switch at the base of the column. trace the wires back and see where they are going.

[Ronno6]

Someone bypassed it and ran a direct run to the starter solenoid is what it sounds like. That connector should be connected to the switch at the base of the column. trace the wires back and see where they are going.

There is no place on the back up light switch for the connector or any other electrical connector.
2 terminals for the back up lights; the rest is just plastic.

The "neutral safety" is achieved by mechanical means of the shifter.

[VileZambonie]

Simply interrupt the wire that goes to the S terminal on the starter solenoid and place the safety switch in series.

[Ronno6]

Simply interrupt the wire that goes to the S terminal on the starter solenoid and place the safety switch in series.

That'll work.........Thanks.