Was driving conversion van/camper yesterday when the CO detector started going off. 3 beeps than nothing then the same thing 20 minutes later. I detected a slight combustion smell. The front win...
OMG! Someone else who doesn't like AC? I love you man!
But to remain on point, unless your detector is hard wired into your 12V circuitry, I too would suspect a failing battery. Those 3 beeps every 20 minutes is fairly standard tell-tale. If you can replace it, do so and see if that doesn't eliminate the problem. Even "new" batteries aren't always new. Best of luck to you and yours.
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