I converted a metro, and I chose the wire by using a light pen ( i'm not sure I have that right. It is a sensor with a light, so when you hit a wire with power the light lights up) Anyhow my issue was that the first wire I chose with a volt meter had 12 volts, but almost no power, so it would not close the contactor.
By the way my blog is here:
electricmetro.blogspot.com ,
I too like the croks n socks
http://forum.ecomodder.com/images/smilies/smile.gif
good luck.