Problem charging House Batteries

Sagecoachdriver wrote:
New batteries are 2 weeks old. I used my Vector 40amp charger to slow charge them. Took 12 hours. When I installed them and they sat in the MH without the shoreline to charge them, they were still 12.9 volts 2 days later. It's not the batteries.
I just went out to the MH. The Battery monitor reads 12.6 volts. I started the engine and it read 14.2 volts and is charging the house batteries at 8.2amps. this is after a 6 hour drive today.
I did a test. With everything off, no shoreline power or engine running. I turned on the interior lights. I started the engine, no difference. I turned off the engine and hooked up the shoreline power. No difference in the light. They would always get much brighter when either the engine was on or the shoreline connected.
I'm thinking it's the converter/charger or the Charge Wizard.
And yes, I do have a good knowledge base for electrical.

First disconnect the batts and with shore power or gen on , does anything 12v work? If not, there is no 120v going to the converter or else the converter is not getting its "12v" to the DC fuse panel to run the rig and charge the batts

The converter at its 13.x volts makes the lights brighter than the batts at their 12.x volts

New batts is the time to do a reverse polarity and blow the converter RP fuses. the rig still works on 12v battery but the fans run backwards.