Gunrunner john maybe you could help me. I bought a smoke unit rebuild, 27ohm, for my k-linfe scale Hudson#5343 while I wait to purchase your upgrade parts. On the bench, loco no tender, I measured voltage in 18v at rollers, and at 3vac board output to resistor. So I disconnected between smk.switch board and hardwired so to speak, from resistor, through switch, to yellow wire nut. On top of motorboard in picture. Bench tested at 18v, good smoke. While buttoning up,this black cap (shorting bar?) falls out! Question, since this happened I tendered up, powered up and addressed ok. Not ok! Lost chuff. Checked chuff microswitch ok. So i put that cap on all 3 legs in pic. Its taking commands but erratically. no chuff, and whistle drops out on loop while commanding. Went through factory reset 740. Even took resistor out of circuit. Is this thing a lost puppy? Think I might just pack this and my crane up and ship it to you! To install your upgrade also of course. 
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