Yes, another Battery question

Hey all,

I would check all the fuses on the 12 volt side of the converter panel. If there is a red LED glowing, the fuse needs to be replaced. Also check the breakers to see they are in the ON position. If the fuses are OK, lift the lid on the compartment and check the ground bus connector and ensure the white wires are all screwed down tight - especially the big thick one, it is the main power return (battery negative pole) and needs to be firmly connected for the system to work correctly. Keep your fingers and tools away from any red wire connections when you are in there and working on the white wires. If shorted, A storage battery can pack a wallop and fuse tools together - and put you on your backside in a flash !!    
Also check both battery terminals to make sure they are tight.

thanks all.

When charging you will probably see something between 13.5 and 14 volts, yes.

My bet is your battery is bad.  That would explain your CO detector alarming after unplugging from AC.  Even a bad battery can read a normal resting voltage (12.7) after charging, and even possibly after resting.  There are multiple things you need to to do test a battery.  After charging overnight, let it rest (no charging, no loads) for at least 3 hours and test the voltage.  It should read 12.7.  Then apply a sizeable load for 10 minutes, while it is still unplugged from a charging source.  In the pod, turning on every light and putting the exhaust fan on high will be good enough.  While everything is running take a voltage reading, it shouldn't be below 12 volts - I'm betting under load yours is falling well below this which is why your CO detector is going off.  Turn everything off and take another reading, it shouldn't be much lower than 12.5.