Do you want cruise control without cutting and splicing wires ? If your truck doesn't have the 4 wire connector then you need gm #26090777. I got mine off ebay from mttopwoman for #30.00 and they have atleast 2 more. There was another seller upip60 that had a new one for $109.00. I searched the internet and new ones from $110.00 to $160.00 from different gm parts stores. You can swap out the complete harness or just remove the 4 wire harness like I did and insert the 4 wires into the 52-pin connector located lower left of steering column. Its very easy. Less than an hour install This is how I did it. First, draw yourself a wiring diagram of the back of new 52-pin connector. On new harness you bought, remove center section of 52-pin connector. You'll see two holes that a small screwdriver will fit into.I stuck srewdriver in to these slots and wiggeled and pried till it came out. Then on this connector you have to slide the blue part off the connector off, then with small screwdriver insert in back of connector where the wire is and gently pull wire out back. Ok, now on your truck unplug 52-pin connector. You'll have to push the grey locking handle on 52-pin connector all the way to the right. You may have to remove the 52-pin connector from its mount ( two clips made to the left side of 52-pin connector.) You push or pull it sliding it forward or backwards I can't rememeber which way I moved it. Once you get it out remove the center section just like on the new one. Then remove blue part same as new one. Then find the hole/slot you need and insert wire. Make sure the pin connector is turned the right way before inserting. Then put it all back together. Mine worked I'm sure yours will too.
Pin #'s
Wires on 4-wire connector = Back of 52-pin connector
Gray/with black stripe = B1
Dark blue = B10
Brown = B18
Gray or Gray/with white stripe = B32