[ray_mcavoy]

Welcome!

I'd recommend using a 12V test light or multimeter (set to DC Volts) to check for power on the various wires. And check to make sure they're connected to the correct terminals on the switch.

The red wire is a power feed to the ignition switch. It should be connected to the "BAT" terminal and be live all the time.

The purple wire is used to energize the starter solenoid. It should be connected to the "SOL" terminal and only have power with the key in the "start" position. Since your truck has a manual transmission, there won't be a neutral safety switch inline with that purple wire like there would be with an automatic. And these years didn't use a clutch safety switch either.

The pink wire feeds the ignition. It should be connected to the "IGN" terminal and have power with the key in both the "run" and "start" positions.

So if the wires are connected correctly and you don't have power on the purple wire in "start" and/or the pink wire remains powered even with the key off, you are probably looking at a bad ignition switch.