Neutral safety switch?

[asolde]

The old 72 c10 started giving me a click when I went to start it. Then I would jiggle the auto shift selector and it would start. It has been getting worst every time I try to start the truck with it just giving me a click. Battery is good.

I have been doing some searching on here and have try to adjust the neutral safety switch with no help. I put the selector in reverse turn the key on and my reverse light are working however I am able to crank the engine and start it in this position.

So do you think it is the neutral safety switch or the starter selenoid/starter?
If I jumper the purple wires and it cranks and starts dose that mean a bad neutral safety switch?
Do you jumper the purple wires and then jumper the switch what dose that do when you jumper the switch?
Maybe I got two things going on......? a bad starter and or selenoid and a bad neutral safety switch?
Got any ideas on how to trouble shoot this?