I am converting a MTH Proto1 with QSI MTH Premier NYC Hudson to Proto 2 3 volt system from a Railking 2-8-0 steam engine. All is done and working except the lights. 2 Questions: 1st, The Railking engine did not have tender lights. Is it possible to wire up the Hudson's reverse tender lights and how would I do that? 2nd, I would like to convert the all lights to LEDs. Is that possible, And if so, how would I do it power wise? Thanks, Gary
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No problem with either of those requests. You will have to connect to pin-4 of the 12 pin connector on the PS/2 board to drive the rear light, the positive side goes to PV which is on pin-2 of that connector. You may have to scrounge up the pins or pre-crimped wires for the connector.
To swap out the bulbs for LED's, just use a 220 ohm resistor in series with the LED and connect them in place of the 6V bulbs. I do this all the time. The positive side of the LED goes to PV.
Thanks so much and you were so fast!
Happened to be cruising the forum. 
Another question. I want to do this same conversion on Proto 2 5 volt Railking Challenger. The Proto 2 5 volt board died. Just to see what would happen I connected the tender from my Premier Pennsy K4 Proto 2 and the Challenger came to life but only the motor with the tach runs (there are 2 motors in the challenge for each set of drivers). Is there a solution for that?
It's a VERY BAD IDEA to swap tenders between PS/2 locomotives. Consider yourself lucky if you didn't toast anything. There are a number of different wiring schemes between the locomotive and the tender. Some of the 5V PS/2 models have the boards in the locomotive. Many of the Premier models will have mux boards, that changes the pinouts as well.
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