Sounds like the alternator is losing the self exciting circuit due to low engine RPM caused by the load hit from the plow pump.
Couple things to try is:
-Use the Tow/Haul mode, this may override the smart charge alt function.
-Unplug the black load sensing module on the negative side near battery, defaults alt to full charge mode.
-Put a smaller diameter pulley on the alternator.
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