Ok thank you, would the resistor in between the gray and yellow terminals in the first photo screw this up?
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This looks like as mention J1939 or EOL. With CAN/J1939 dry contacts won’t work other than the fact that it will appear as a “bus off” error causing comms to “fail” on every device connected to it. If it’s only the generator this may not be a bad thing. All serial protocols (Modbus, CAN, LON) are jammed by a dead short.
It could be EOL. In this case the alarm panel is looking for a certain resistance (voltage drop). A “short” indicates alarm. An open indicates broken wire. This is a common fire alarm wiring scheme with smoke detectors but I haven’t seen it in gensets.
I highly doubt it is using NC contacts like an E-Stop because of the resistor.