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I'm talking about an MTH shell from around 2000 with LEDs already aboard (and their plugs).   These are marker light LEDs, all other lighting on this installation will be provided by the L 57 bayonet bulbs....it would be neat to get the markers to work, otherwise I have to knock the LEDs out and install clear plastic for lenses and paint them on the inside.  

If  you're talking about the standard MTH LED's, they are two red LED's in series.  Consider their operating voltage to be around 4 volts and work from there for the resistor value.   If you're running with TMCC light outputs or conventional from track power, try a 1k ohm resistor and a series diode in the red lead, band point toward the LED's.  That should light them fine and give you plenty of operating margin. 

Of course, using LED's for the headlights would result in a much nicer look IMO, but since you are going with the bulbs...

Look closer.   Right near the plug, under the heatshrink, they wire the two in series.  However, there are also some that are indeed in parallel, it's useful to know what you have.  If you have the parallel ones, try a 470 ohm 1/2w resistor for track power.  The PS/1 Premier models had a 6V power board with one or two plugs with series resistors for LED's.

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Last edited by gunrunnerjohn

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