I went to check the batteries in the MH two 6 volt and when I removed the filler caps noticed the water was bubbling (boiling) what causes this and what do I need to do?? Thank you
control panel battery check reads 13.5 for both the house batteries and the chassis battery. the only charger I have is the small roof solar panel. I will have to take the house batteries into Sams club and have the check for a bad cell. Thanks for the replies.