Update on battery issue: It has been too cold lately to get at it, but next week looks warmer. To fully explain issue: First of all the rv is plugged into the 120v electric and has been for the winter, The coach battery appears to be charged yet I do not have coach power if I unplug the 120v, The main (starter) battery loses charge even while plugged into 120v but will accept a charge from a portable charger when hooked up separately. Both the 5a fuses on either side of the relay are ok, Any suggestions other than already given? Sam