Changing Engine Lights

Discussion in 'FAQs' started by Ben H, Jan 19, 2003.

  1. Ben H

    Ben H Member

    In one of my P2K 0-8-0 steam switches the lights either have to be replaced or aided with a resistor when you switch to DCC.

    I will have no problem with the tender but the engine is a little bit of problem.

    1. I could use the resistor but it will need two, one for each bulb or.

    2.replace the lights by using 12-14 volt bulbs.

    Has anyone done this to a P2K 0-8-0 steam switcher, because it looks like some very tight fitting will be required in the engine boiler at the front.

    Current bulb is a grain of wheat and the 12/14 bulbs are bigger.

    Your experience or ideas would be appreciated
  2. 60103

    60103 Pooh Bah

    One of my friends did something like this to his 0-8-0 and ended up with the bulb melting the top of the smokebox. Be very careful with what you put in there.
  3. Ben H

    Ben H Member

    Yes 60103 thats the problem I would like to avoid.

    It appears that a resistor would be the best choice as it would reduce the amps and related heat factor in the smoke box.

    Thanks for adding your comment - hope someone can discuss what they did.
  4. boppa

    boppa Member

    whats the original voltage of the bulb and whats the track voltage??
    need to know the current drawn by the bulb as well

    resister = (track voltage - original bulb voltage) / current drawn by bulb

    then get the closest one in value thats BIGGER than the calculated value
  5. sumpter250

    sumpter250 multiscale modelbuilder

    I'd also suggest that when you go to get the resistors, pick up a wirewrap tool(small hand operated, about the size of a small screwdriver). Solder the "power"end of the resistor, and wrap the lamp wire on the other resistor lead. The connection will be solid enough, and lamp replacement is a simple matter of wirewrapping the new lamp leads.
  6. Pete

    Pete Member

    Any consideration to using a small, white LED instead of a bulb?
    The make almost no heat, and are automatically 'directional' by nature (not sure if steam loco's operated that way or not??)
    The LED's are available in 3mm and 5mm sizes, and will also need a resistor to keep from blowing up. You can sometimes snag some on eBay for about 20 cents each (bought in bulk, of course) and sometimes as high as $2 a piece. I recently bought a pack of 100 3mm 6000mcd ones for $20 US plus $10 shipping and they are a near identical match to the ones in my Kato SD40-2's.
    Just thought I'd throw that option out to you...


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