harness question PLZ help

[1970 C10 MJW]

I am almost done depinning/ reorganizing my harness...a 1999 silverado 4.8l and I am trying to figure out what these 4 wires need to do...
first off my dad said they came from the fuse/relay panel two wires are a heavy gauge green, 1 is purple/white, and the last is yellow... all 4 of these wires go into the section of the harness for the transmission... both of the greens, the purple/white, and the yellow all go into the 6 pin transmission plug that was glues in from the factory... i will provide a pic here asap...

[1970 C10 MJW]

this is the connector i speak of.... please help me guys

[ls1nova71]

The purple and white wire comes from the crank fuse, or the start side of your ignition switch. The yellow is the wire that goes to the starter relay. The green wires are B-shift interlock, and F- back up lights.
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[1970 C10 MJW]

Originally Posted by ls1nova71

The purple and white wire comes from the crank fuse, or the start side of your ignition switch. The yellow is the wire that goes to the starter relay. The green wires are B-shift interlock, and F- back up lights.
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Are these needed?

[ls1nova71]

Technically, you don't NEED them, but it's nice to have them hooked up. If your column has a neutral safety switch, you can use it. The transmission mounted ones are just a little more accurate, since any slop in the shift linkage doesn't affect it.

[1970 C10 MJW]

ok well i guess i could use them.. how would i wire yellow to the starter relay? and what do the greens wire to? and what does the purple wire do?

[mrhurt73]

i had to draw it out before it made real sense to me
see attached picture the left side of the photo shows internal wiring diagram
right side shows descriptions that make sense.

hope this helps

[1970 C10 MJW]

thanks MR HURT