I just recieved my spare sensor bar today.
this is how I rigged it up.
it's similar if not exactly the same as the pencil method haha
what you need:
1.) chinese take out chopstick (the flat ones you have to break apart)
2.) 2 wires (I pulled mines from an old S-video cable that was already cut)
3.) a utility knife
4.) 2 test leads with aligator clips on each end
5.) one 9v battery (you could use a universal AC to DC transformer too if you wanted)
you dont need to cut or modify your existing sensor bar and the wires coming out of it
-First i seperated the chop sticks
-Then using utility knife strip/carve (you might want to start on the the fatter side of the chopstick) one of the chopsticks down until it 1) is in the shape of the sensor bar plug and 2) fits snuggly into the sensor bar plug and 3) you can strip down the top and bottom just a little to compensate for the wires that you will be pushing against
-cut down the chopstick length to your liking that way you dont have this huge thing sticking out.
-strip both ends of the 2 wires (those would be the ones I pulled from an old s-video cable)
-on one end of each wire fold the the exposed wiring until you have something like a little ball (this just helps to make contact with the metal inside the sensor bar plug)
-now lay the sensor bar plug on it's side and position each wire so that they are on opposite sides of the sensor bar plug (making sure they are not touching each other)
-assuming you already tested the chopstick to see if it fits snuggly push the chopstick into the plug
-if you have the tool, then check continuity between the two wires they should not be touching each other if they are pull the chopstick out and do it over again otherwise you'll short something out
-if everything checks out use the your test leads and hook up each wire to the correct terminal on the 9v battery
the polarity of the sensor bar plug is exactly the same as the wii's power plug (look under you power supply there's a diagram of he polarity)
if you're lazy here's an ascii version:
ignore the astericks they are just there to fill in empty space
i reversed it when i was testing it out and i didnt see any ill effects but then again i disconnected it immediately when it wasnt working.
I used a digital camera to see if the LEDs were on.
a cooler mod would be to use a universal plug instead of test leads so you can hook up battery source or AC to DC power source. I gotta check out radioshack for that.
hope this was helpful.
now if someone could figure out the correct voltage and amperage that the Wii is spitting out in the back....