Edgebot Mini-sumo

Well this is my first partial success building robots, my symet did not work :P and I am still trying to figure out what is wrong with it:P I got the book from Mark tilden and I tried to build it as per specifications, but i did not have at hand the same parts. I used 2 Hobbyking servos for motors and two mini relay for "brains" I was really happy when it first started running forward and it seems to have some good strength to push (see video) but My problem is that the edge detection sensor do not work, I made the realy twice and tried to check and twitch every connection. Afterwards I checked a single relay and it seems that the voltage is too low to activate the reverse mode :P Anyway I ordered new parts from SOlarbotics I will post ASAP regards EZ