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Old 02-04-2025, 05:23 PM   #1
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Big Boy Battery isolator

Could one of the two Big Boy Battery Isolators on my Thor Mandalay be humming because of low coach battery power? I checked all four coach batteries and the specific gravity is low in all four.
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Old 02-04-2025, 05:29 PM   #2
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They hum when they are engaged. One will engage when the chassis battery needs charging AND the house batteries ARE charging.
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Old 02-04-2025, 05:31 PM   #3
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Toss them and replace with some electronic ones for about $20 each and all those problems are solved.. For good...
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Old 02-04-2025, 06:05 PM   #4
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Mr. Ted, Maybe you should reference these $20 , 200 amp isolation relays you suggest.
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