STEP 3: Mount the regulator
Next go ahead and mount the 7812 regulator and solder it in place. You only need 1 of the 2 female 3-pin sockets from the y-cable so cut one socket free from the Y-cable assembly leaving the wire as long as possible. That leaves you with the other female socket and the male plug, neither of which is needed so cut those off and leaving just the wire. Discard the severed socket and plug. I bought the Y-cable as a convenience since it had the already wired socket I needed and some extra wire. In the remaining hole that was drilled in the +12 volt island, solder one end of the red 6 inch loose wire and on the other end of the red wire solder an 18-22 gauge female spade terminal connector. This end will plug onto the thermostat switch once it is mounted in the Enforcer chassis.
Finally, solder the loose end of the black wire attached to the 3-pin female socket into the hole that was drilled into the ground circuit run on the PCB. On the red lead also attached to the 3-pin socket, solder another 18-22 gauge female spade connector. This end will attach to the other end of the thermostat. You can cut off the yellow wire as it is not needed.
One last wiring task is to cut the red & black wires attached to the 3-pin socket about midday in their length. I attached Futaba J 2-pin crimp connectors to the cut wires and this will allow the PCB board to remain removable after the socket and the thermostat are mounted. Again, see the pictures and the need will be obvious.