need help with bachman shay

[cacole]

If you have a voltmeter and DC power pack, connect jumper wires from the power pack's variable DC terminals to the headlight wiring.  Turn the throttle on the power pack up very gradually until the headlight illuminates at the level it has been illuminating on DC at full throttle, and measure the voltage.

If it's 12 volts or slightly over, you don't need a resistor; however, I think some decoders recommend a low-value resistor to prevent a current surge through a cold bulb filament from burning out the decoder.  Check the decoder documentation and see what they recommend for the headlight wiring.

[mmartian22]

thanks i thought would have to add resisters in this shay

[Darth Santa Fe]

Bachmann's lighting is usually 12 volt, unless it's LED lighting, which I think is 4 or 5 volts. Based on Bachmann's diagram on their website, the Shay uses their regular 12 volt lighting, so your Tsunami should work fine with your Shay's lighting.

[mmartian22]

 i bought a tsunami tsu-750 decoder for a 3-truck shay .i 've installed the decoder in cab  area  along with plug and speaker in tender.  what i need to know is will  the lites bulbs operate without burning them up .not sure voltage of bulbs .factory installed bulbs .tried to disassable engine the plans  were to install led's ,but found quite difficult to do.