Here's how I wired it:
The quick’n’dirty:
Cut the [Y] yellow wire at terminal 12 at the diff lock control unit harness.
Cut the [V] violet wire at terminal 11 at the diff lock control unit harness.
Strip insulation from [B] black wire at terminal 3 at the diff lock control unit harness.
Strip insulation from [R/B] royal blue wire at terminal 1 at the diff lock control unit harness.
Connect DLCU side of yellow wire to relay terminal 1.
Connect jumper from royal blue wire (power) to relay terminal 3.
Connect diff lock solenoid side of yellow wire to relay terminal 5 (diff lock solenoid terminal 4).
Connect DLCU side of violet wire to relay terminal 2.
Connect jumper from black (ground) wire to relay terminal 4.
Connect solenoid side of violet wire to relay terminal 6 (diff lock solenoid terminal 2).
Connect jumper from royal blue wire (power) to hot side of rocker switch.
Connect jumper from black wire (ground) to other side of rocker switch.
Connect jumper from load terminal on rocker switch to relay terminal 7.
Connect jumper from relay terminal 8 to black wire (ground).
