Hi, I have a Atlas New Haven RS-3 from the last run about 2 years old. This is the TMCC w/ cruise version. All has been great up until last night when it started to stop on switches, Atlas as well. I deducted via testing that the long hood pickup roller is not working. Before I call Atlas and send it back I would like to open up and see if I can figure out what is wrong. Has anyone worked on these? Is it easy to pop off the shell etc....? I have worked on Lionel but never a Atlas loco. Any advise would be appreciated. Thanks!!
Look for a broken wire.
I agree on the possibility of a broken wire at the pickup roller. Sometimes a weak solder job is revealed after the trucks turn on a few curves and the wire breaks loose. Follow the wire to the break. BigRail.
You can check for a broken pickup wire without opening up the engine. The rollers are connected to the same location inside the engine. Normally, there should be a direct connection between the rollers and would show up as a "short" on an ohm meter. If the connection is broken or "open" you'll get an infinite resistance.