prob W/ different warp to rev

[MAC]

I am trying to run my warp off the 10-11 volts output to the motor for the rev. However when I put the wires from the hopper to the wires for the battery for the warp it turns the warp motor on continuously. It does not shut off at all. If I put the one 9V battery back on it runs fine. Anyone know why the warp motor runs constantly in this configuration?
Thanks
MAC