Alternator discharging!
2002 Itasca Horizon DP 5.9 Cummins. 420 Watts Solar Magnum 2 KW pure sinewave inverter/charger SC 230 30 A Solar controller Trimetric TM 2030 Monitor 500A shunt 4 GC House Batteries 2 Group 31 ...
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Sounds like bad diode(s) in alternator. Grounded diode(s) can cause battery discharge.
