it's probably the smoke detector with a dead 9v battery.
if not, it's the CO monitor and a low trailer battery.
if it's a low/dead trailer battery, you need to install a battery disconnect switch, otherwise, the CO monitor, radio and other parasitic power drains will result in a dead battery.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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