MTH tender backup light

A resistor and a diode will do the trick if you want to power it from the motor.  Since the polarity of the motor power is dependent on the direction of travel, you can wire it so it's only on when moving in reverse.

A question.  Is this a PS/1, PS/2, or PS/3 locomotive?  If so, there is already a feed for a reverse light.

The Berk and Mohawk are what I would call pre-proto sound and the Hudson is proto one. Thanks

Well, the Hudson has a 1.5V reverse lamp output on the board set, you can use that with a 1.5V bulb.  In order to use motor voltage for LED's, you'll want a 470 ohm resistor and a diode for reverse voltage protection connected across the drive motor feed lines.

@gunrunnerjohn posted:

Well, the Hudson has a 1.5V reverse lamp output on the board set, you can use that with a 1.5V bulb.  In order to use motor voltage for LED's, you'll want a 470 ohm resistor and a diode for reverse voltage protection connected across the drive motor feed lines.

Thanks John. I'm very inexperienced with electronics, would you be able to provide a sketch of installing the resistor and diode? Sorry to be a pest.