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Fitting a Stay Alive to Sound Fitted Bachmann Class 40


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Hi

 

I'm looking to fit a Lais Stay Alive to a Bachmann factory sound fitted class 40.  I've done a trawl online for either a instruction/video of somebody doing similar or a wiring diagram of said decoder but have drawn a blank.

 

Would any kind soul know which are the +Ve and GND pins of the decoder used as per attached photos, to which I can solder a Stay Alive unit? First picture with circular sticker is obviously the top of the decoder and the second picture the bottom.

 

20240310_1425551.jpg.b407d7cb400d71810e4938096ce2fe57.jpg20240310_1425291.jpg.804f1971d8ee95fd7026d98ea41d2b38.jpg

 

Many thanks

Simon

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A look online for the standard 21pin connections shows Pin 16 as being +ve and Pin 20 being "ground after rectifier " (-ve). I have used these connection to add a Lais stay alive to a Rails Connect decoder and it worked a treat. Assuming Bachmann have followed this convention all should be okay.

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