Batteries Not Charging

HavingProblems78 wrote:

With batteries connected in MH I tested voltage with a voltmeter & got a reading of 12.2 All test points I tested I got a reading of 12. 2 except on output side of converter I got a reading of 13.6 I pulled battery & had it tested & was told it was good Not sure what good entails Returned home 7 put a charger on battery was 3 hours & then checked voltage & got a reading of 6.42 but waited a few minutes & then voltage went down to 6.18 I'm told this is good but as I understand 12.6 is a fully charged battery when 2 6 volt are connected in series With the battery I pulled & charged & got a reading of 6.18 how do I get to 12.6 when I only get 6.18 x 2 or 12.36 I'm told batteries determinate over time & I can understand that but I'm trying to determine why my batteries when hooked up in my MH are not charging Maybe its just my batteries???? Plan on taking battery back to Napa Auto & they are going to load test it
Any comments

I assume that you hooked a charger directly to you battery bank. For most chargers, 3 hours isn't likely near long enough to recharge them very much. I'd leave the charger on overnight and see what happens. And don't test the voltage immediately after removing the charger. There will be a "surface charge" that reads higher until the battery chemistry reaches equilibrium. But as has been pointed out, if the converter output is higher that what is seen at the batteries you have an issue somewhere between them. In our previous coach, there was a well hidden circuit breaker in the middle of the wire between the batteries and the converter.