One of the small wires on the tender chassis of one of my 4-6-0 On30 engines broke. I ordered from Bachmann a new tender chassis and when I received it I plugged in the engine and tried running it on my NCE Power Cab. It will not run on the default address 3 and when I try to program it to respond to address 2 since this engine is labeled 2, I get the message "cant read CV, main off". But my other three engines run fine. There is 12.5 volts to the track but this engine will not run at all. I'm puzzled. All I did was plug in a new tender chassis into the engine because the old tender chassis had a broken wire. Any ideas why this engine with the new tender chassis does not respond at all? Thanks....Don