Originally Posted by Carol DeVries
We purchased a 2018 Coleman light. On our first visit to work on getting set up, the command module was working. Today - the screen is blank, and nothing works in the trailer. The battery is connected, shore line is connected, pushed the reset button and power button on the module, but I get only a blank screen. Has anyone else had this problem?
What can cause dead batteries?
Charger turned "OFF"
Main fuse blown
loose or corroded connection
entry door 12 volt switch turned "OFF"
disconnect switch near battery turned "OFF"
battery not disconnected or plugged in for storage
Plug into shore power. Measure voltage on battery terminals. If charger is working, voltage will slowly rise to more than 13.0 volts with in 4 hours. Modern chargers will regulate at 13.6 volts. Some will provide 14.4 volts for a period of time.
It may take 14 to 18 hours to fully charge a lead acid battery. Fully recharge during storage before voltage drops below 12.4 volts.
Lead acid batteries stored discharged for three months are probably dead and not recoverable. Stored at low state of charge for a few days is probably OK.
With every 12 volt appliance turned "OFF" a typical travel trailer battery will last one to two weeks before being to low to work.
There are 12 volt devices that are "always ON". This is referred to as "parasitic load".
See attached file for optional storage methods.