WbB GP30 Series Wiring with Pics

If you can please supply the part number of the thermistor.

Dale H

AND how is it wired in???Thanks for the info!

I used inrush current limiting (thermistor) devices picked up from DigiKey.  These are CL-160, P/N KC016L-ND. 

The thermistor is simply wired in series with the two motors.   Blue wire from one motor connects to the thermistor,  other side of the thermistor connects to the yellow wire from the other motor.

The thermistor is a resistor whose resistance varies with temperature.  As it gets warmer, the resistance decreases.  It can be used to limit the initial flow of current and voltage for a gradual start.   On the GP30, I used only one.  On my older engines I use two.  The GP30 is not quite the racehorse that older Williams locos are, and I think two thermistors might take "too much off the top", but I did not experiment to confirm.

These are 2.8 Amps, you can find them at higher current levels if needed.  Resistance varies from 5.0 Ohms at room temp down to 0.2 Ohms when warm.

-- Ken 

While you were in there, did you try to increase the "engine sound" volume? If you did, How?

Jim 1939,  I did take a quick look, but saw no obvious way to adjust or increase volume.  For me, the volume is just right, but I can see where some might want a bit more.  -Ken

Thanks Ken, I found one very small pot but turning it did not change the volume so I set it back where it was. True it can be heard but I would have liked just a tad more..Jim