If those CO monitors are 5 years or older they are no longer useable and need to be replaced.Seems to me that on my boat the monitors are wired directly to the batteries( one or the other ) much like the bilge pumps.Check on your safety breaker panel beside the breakers for the bilge pumps, maybe there.Might I suggest a new thread about this, you have 7 pages and hard to check back thru, different subjects......

2000 carver 356 aft cabin batteries
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bud37
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