Originally Posted by dhatfield6
Its a new battery and tests good.
Your first note says it is 13.7 volts which is impossible and if that is a correct reading I am going to suggest that you were reading voltage in the coach while the charger was on ....in other words ...you were reading the charger...not the battery. Get yourself a turkey baster at the local auto parts store.... hydrometer. Remove battery caps and Suck up the fluid out of each cell and take a reading.
The specific gravity readings you take should not vary by more than .1 from cell to cell AND here is what they represent:
If you are not at 100% ....keep on charging your battery....suggest leaving yourelf plugged in with charger on overnight.
Make sure you ARE charging by going to your battery terminals
and taking a voltage reading with a voltmeter while plugged in... you should measure somewhere between 13.2V and 14.6V depending on how depleted the battery is....13.2 when you near 100% ....14.6 if you are below 75% charged. If you don't see voltage like this...your charging system is not working and you should check to see the salesman switch is turned off (your 12V lights will work inside the coach when it is in the right position). Alternatively..you may need to replace a fuse on your battery charger/Converter or on the 12V fuse panel inside your coach. Worst case..converter is dead ...but that is unlikely.
If it doesn't test to 100% by the morning then your battery is NOT good.
AGM batteries will NOT solve your problem. The problem is with either the battery or the charging system and if the latter...then swapping batteries is not the answer.
There are plusses and minuses to AGM vs. WetCell batteries. Lets find the problem first and then figure out if you would benefit from spending 2-3x as much for AGM's vs. a good DEEP CYCLE wet cell.