Mike,
Thanks for the info. I already have the installation manual though. The steps you mentioned are the steps I completed initially and again after I discovered the chuff issue. John hit the nail on the head with the PIC issue due to a patent dispute with MTH. The “diesel” chuff rate was programmable in the aftermarket EOB’s to allow the smoke fan to slow at idle and rev up while under way without creating an audible chuff.
John,
The microswitches came attached to a male plug and an additional switch to select between 2 and 4 chuffs per rev. I believe one of the axles had two cams originally. One had 2 lobes and the other had 4 lobes. The micro switch plug connected into the 4 pin smoke socket and the wire was aligned with the chuff pin on the board. I’ll have to take a closer look at it later tonight. Thanks again for your input!
