Spaghetti

Here's the basic harness wired into the Arduino board. The three-pin header is the power connector, ready to accept +12, gnd and +5v connections from the transistor switch contraption that I'll put together on a breadboard later.

I used very fine enamelled wire cohabiting the protoboard holes with the socket pins. A good application of heat and solder later - bingo!

To connect the wire to the header pins I put a tiny blob of solder on the iron tip and insert the cut end of the wire. Within a second or so the enamel melts and you can see the solder flow around the wire. It's then ready to fix it to its destination.

And what better to listen to whilst soldering than some very fine oldskool belgian skizzo??