Well, after examining the contact plate and the wiring from the windings for a short as CWburfle recommended, I found the unit would run fine (in both directions) when the plastic shell was off, but when I placed the shell back on, the one direction problem reoccured. What I found was that the base of the metal lamp holder in the foam holder was being pushed down onto one of the soldered contact points on the contact plate. Once I placed a piece of electrical tape over the base of the lamp holder, I found the problem solved.
One more question. I see where others have had problems with the bulb melting the plastic shell. Is the foam supposed to cover the bulb or just the metal holder in order to prevent the heat? Is it possible to change to a lower heat LED light bulb in place of the original unit? I'm just interested in preventing any future melting.
Thanks
Your recomendation of changing to LED bulb sounds like a solution. There where a couple of units that heat caused problem. Some of the problem was from consent running and the motor getting hot. ( trolley and gang bump and change directions where 2 of these. ) Any of the small engines with a pul-mor type engine. even the small switchers like the Army 41 etc where known for this problem also.
Life's hard, even harder if your stupid John Wayne
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The lamp socket is encased by the foam, not the glass bulb.
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