Today I performed my scheduled maintenance on my Lionel 6-11208 Union Pacific Big Boy engine #4011 from 2010. This included removing the boiler to grease the worm and gears. After reassembly, I test ran it only to find that the DynaChuff no longer works, including both sound and puffing smoke at slow speeds. Smoke comes out steady as it did when a board transistor went out in my S-Gauge engine. I checked all switch settings, did engine resets, checked for loose connections, etc. Is there any specific component I can check for a remedy, a certain board I can replace, or is it a send-in-for-repair situation? Any advice would be appreciated, as this happens to be one of my favorite engines.
Original Post
The chuff switch is kinda' buried by necessity, they logically need to be on an axle to be synchronized with the drivers. You were lucky with that wire, the chuff switch works by grounding the input, so pinching it didn't endanger electronics. Pinching other wires to the frame frequently has more catastrophic effects. 