It comes on when there is a "heavy" DC load. Heavy in my coach can be anything more than float charging the batteries. So if I have all my lights on at night the fan runs until bedtime.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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