Can anyone identify the positive and negative solder points on the H622X board installed on my older 44 ton locomotive.
Doesn't anyone know where to solder a keep alive to this board?
?
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Doesn't anyone know where to solder a keep alive to this board?
![Huh? ???](https://www.bachmanntrains.com/home-usa/board/Smileys/default/huh.gif)
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