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@TheSteve posted:

I have a ps 3 rail king steam engine its a split system with main board in the tender and an mux board in the boiler I want to connect a cab interior light Anyone have a pin out diagram for a mth boiler mux board thanks.  

Pin 27 of the PS/3 boiler board is the interior light.  Obviously, you have to have a sound & chain file that enable the interior light control...

Thanks for the reply but I have an issue with the headlight fet it don’t work so I want to use the interiors connection to power the headlight.  Can I use a led without a resistor or with a resistor? And if so is the purple wire + or - ? So it’s pin 27 and the purple wire.   Can you point out where that pin 27 is located.  

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