It could be the converter, mine went bad and the 2 symptoms were inconsistent, incomplete battery charging, and fans running continuously when no shore power and no 12v draw. WFCO replaced it on warranty and the new one is working fine so far, fans only run when they should and batteries get a good charge (same batteries).
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2002 Ford F350 7.3 Super Duty XLT 4x4 CC LB SRW -- Pullrite Super 5th 16K
2017 Keystone Carbon 337
2022 Honda CRF-450R
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