I reversed the main rotor plug with tail rotor plug and now the main rotor works, but the tail does'nt. I tried changing the polarity, still nothing. And all three servos do work. I'm about to go to my LHS. These people don't like to take stuff back. They'll probably tell me the send it back to the Horizon. Years ago I bought some 2 part epoxy from them, and got home the hardener was all dried up. They would'nt give me a refund on a $7.00 can of epoxy. Since then they have lost ALOT of my business. At least $2000.00 (over the years) worth for a $7.00 can of epoxy. Anyway, thanks for the help so far. Any other thoughts ????????