@Jeff_the_Coaster_Guy posted:It looks like there's a couple of diodes and I think a red zener diode on the boiler MUX. I'm guessing they make sure the lights are always fed the correct polarity regardless of the motor direction current. And there's a couple capacitors, not sure what they're doing.
PV is always positive, so there's no need to "insure" the lights get the right polarity, that happens anyway. The two diodes are likely to create the PV voltage as I previously described.
Also, it looks like your digram (way cleaner than mine, but it looks like I got everything right) doesn't account for the tether connector board having two connectors on the PCB. It confused me because pin 1 on the tender side connector isn't necessarily pin 1 on the boiler side connector. I spent some time matching them up with my meter yesterday and the result is in my drawing.
Since My drawing is right from the MTH documentation, it's hopefully pretty close to correct.
Your comment confuses me, my diagram clearly shows the mux board connected to the tether, that's the second connector.
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