gen 3 cruise control. i need help!

[misternash2]

i've got a 1985 chevy with an 04 5.3. i'm lacking the cruise control. at the stock (85) cruise plug in the engine bay i've got 5 wires.

blk
tan
lt blu/blk
dk blu/wht
lt grn

i know the tan is the power as i've got 8v when the cruise power switch is on and 0v when it's off.
i can't get anything on any of the wires when i push the resume/acc or when i push the set/coast buttons. i've looked around on the internet and can't find any cruise wiring info. can any of you guys help? i've got the info on what wires are what on the 04.