Woodcote, actually i did the mod, which is just unsoldering two wires, switching positions, and resodering, before i ever used the powerbase at all. Afterwards i connected wireless controllers and cars. In subsequent testing everything worked flawlessly, until it didn't. Andy, i presume that a short would trigger overload functoin and base would shut down unitl problem resolved. We'll figure this out when i get back home, maybe. Thanks.