We finally got around to doing it yesterday, thanks to
@Wh4t3v3rs diagram and instructions.
I took my little battery charger and hooked up the controller and a relay to figure out which wire was the constant 12V+, it turned out to be pin #3 on the big connector. I pulled the 30A fuse and used a 10A since I'm only using the remote entry.
My son was hoping he could find the wiring harness under the dash somewhere but, after searching for a while, we decided to pull the door panel, oh well.
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Before installing it, I connected the power and lock/unlock wires on the bench with heat shrink crimp connectors.
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On my 88 the Black/White wire turns into Black/Red before going into the door. So we connected the Light Blue and Black/Red. The biggest problem I ran into was self induced - I kept getting mixed up with wiring the relays. I forgot the sockets were the mirror image of the relays, doh! But I caught it before we installed them. The relays are behind the kick panel (we fished 4 wires through the door to cab boot). The controller is under the dash next to the Dakota Digital interface box. enlarging the already existing rat's nest
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SOMETHING'S WRONG, IT WORKED THE 1ST TIME AND ACTUALLY LOCKS WHEN YOU PUSH "LOCK" BUTTON TOO