New 6 volt golf cart batteries seem not to be charging

[smsinville]

I have a Heartland Edge trailer...21 ft...year 2010. I've had no issues with the single 12V house battery. We're planning a trip that will involve lots of boondocking, and so I've put in two 6V golf cart batteries; the gel kind. AFter that install, the battery status showed "full". As a "test", I turned on some lights and a 12V fan to see how long I could power them. AFter 3 days the simple battery status gauge (stock one, with tank status lights) showed about 2/3. So I plugged back into shore power to check recharging. Even after 5 days the battery status is still at 2/3. It appears the power center is is not recharging those batteries. Any idea what could be wrong? I do plan to use a multimeter to see what the 12V wire leads show, what the two batteries show. Maybe I just need a more sophisticated battery status indicator?

[opnspaces]

Make sure you wired them in series. You can ignore the battery disconnect in the diagram if your trailer doesn't have one.

[beemerphile1]

New install? You connected them wrong or simply left a wire off. Redo your install.

[agesilaus]

Our progressive converter has three reverse polarity fuses, same principal tho. Check the breakers. Progressive tells you to remove the positive cable from the converter then check the output. If it is 12V then it is working, if not it isn't.

[Boon_Docker]

Two things to check.
1- Make sure the circuit breaker for the converter is not tripped.
2- Check the two reverse polarity fuses on the converter (30 or 40 amp fuses).

[BFL13]

New batteries, good opportunity for a reversed polarity which pops the converter fuses for that. (maybe two 30a fuses on the DC fuse panel or else on the converter)

So you are on battery with the wires reversed, the lights work, but the fans run backwards.

If red and white, red is pos. If red and black, red is pos. If black and white , black is pos.

The battery monitor is a rough voltmeter. A full battery is 12.7v, so the converter at 13.6 will show as full even if the battery is nearly dead. With no converter (as now) it will show the actual battery state (roughly)