what could it be? nuetral safety switch issue 1991 sub.

[jonzcustomshop]

The other day my 91 1/2 ton 4X4 suburban (still a squarebody!) wouldn't start, in park key all the way forward -nothing.... after checking the battery/connections, the fuseable links I was stumped.
then out of nowhere on a try it cranked over.
-then nothing again
I mentioned this to a friend, and he suggested to try moving the shift lever around in neutral and or park to see if there was a sweet spot to get it started.
that worked!
it has been starting fine, about 20 times, and only 1 other time did I need to move the shift lever to get it going.
then this morning -nothing, no moving the lever-nothing

I did a quick internet search, and it looks like the green/blue wire is for the reverse lights, the other post has orange and black. - I put a jumper between the orange/black to bypass the switch- that did not work

I went into my parts trucks and found 2 switches that had the same plugs

I tried both of them and still nothing...

now I am stumped
any suggestions?

here are some pics of what the switch looks like I pirated from a google search