Painless wiring harness, reverse lights dont work

[zacharywest34]

Hi everyone I have a 1971 chevy c20, last fall I put in a new painless harness in my truck part number 10206 the 28 circuit one. Since I have had the harness in I havnt had reverse lights that work when you shift it in reverse, when I took the harness out there was wiring going into the trans and with the new harness there isnt, I dont know if that was and input to the reverse lights or not. Also on my neutral safety switch I only have the two purple wires going to it. When I put the backup fuse in the lights stay on constantly no matter what lever position its in. Has anyone installed this harness and have a solution or know what I did wrong?
Anything helps thank you.