Hi,
Working on my K-Line TMCC PA-1 AA. Adding smoke and electro couplers.
Traced and mapped all the connections from the Receiver board and was getting ready to connect when I noticed something odd.
According to the Lionel wiring diagrams, the middle pin on the smoke unit is chassis ground and the two outer pins are AC Hot. See attached PDF
On the K-line smoke units they seem to be wired the same way but they have a red wire for both of the chassis ground for the fan and resister.
And black for what should be hot. Two units the same way. Am I missing something. Should the Black wire go th the Smoke output on the TMCC board?