I can’t help with wiring specific to the Delton C-16, but I spent a few hours yesterday experimenting on the bench with a LM-3S-G to determine how to power higher voltage lighting.
On the screw terminal end:
V+ is roughly the battery voltage less a small amount for circuit loss. I was using a 12V bench supply that puts out about 11.6V and was reading just over 11 volts on this pin.
COM is a non-switched negative return for all voltages.
+5V (both) is a constant 5 Volt positive voltage when the board is powered
On the 9 Pin connector, the Output lines (1-6) are all switched grounds to be used for lights or low-current applications.
For 5V Lamps or LEDS, feed the + side from the +5 screw terminal
For higher voltage Lamps or LEDs, feed the + side from the V+ screw terminal.
(for LEDs, be sure to use the appropriate current limiting resistor)
I ran these tests to determine if I could do two things on my current Bachmann 45 Ton center cab conversion. I want to be able to switch power to the cab light which is way too dim on 5 volts. I also want a switched 12-15V output on an MU cable at the front of the loco to power the LED headlight array on my wedge plow. I didn’t test the plow (yet), but the cab light works great powered from the V+ terminal.
I don’t know what the current limitations are on the voltage sources / outputs. To drive a smoke unit you may wish the add a relay to switch a direct battery connection to the smoke unit.