I am trying to find a replacement bulb for this MTH engine, the engine has QSI electronics, the incandescent bulb has two leads, one end soldered the other end crimp connector in a minature male two pin connector, engine probably late 1990's, bulb diameter .122 inch., approximately 1/4 inch long.
If the bulb connects directly to the QSI board, it's a 1.5V bulb, if it connects to a CV board, it's a 6V board. Since that page lists directional headlights, it's likely the 1.5V bulb. How long is the wire on the bulb? I have some of the 1.5V bulbs and 6V bulbs.
A simple way to test is connect it to a 1.5V battery, if it's fairly bright, it's the 1.5V version. If it's very dim, it's the 6V bulb.
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