Converter problem?

[donajohn]

Sorry. This was originally posted to "Help" section by mistake.

I'm plugged in to 50A shore power. Battery seems to not be charging. 12v lights are dimming by the hour. Other lights and outlets work.
On my breaker box, the far right breaker won't reset. This breaker is the only one not labeled. I'm in a 2007 Montana Mountaineer 336RLT.
When I arrived this Campground, plugged in to 50A plug and one side of the trailer lights/outlets didn't work (worked o.k. on 30A plug). Owner fixed circuit and now all lights work.
Is it probable my converter is shot? Or possible some other explanation.
(Didn't notice this problem at last campground, but it's possible.)

So here's the next installment:
1) Had Walmart test the battery. They say o.k. but needs charge
2) I have battery connected, runs the lights o.k., a little dim.
3) I have my battery charger connected to battery at the 6A setting but battery only seems to maintain charge. Won't go much above 12.4 volts.
4) I've got power to the converter via the plug in the back of my circuit box.
5) Converter fuses are not blown. But when I pull the bottom one and re-insert, the fan comes on for about 5 seconds and then stops. Otherwise the fan hasn't run more than that since I started this process

I'm going to disconnect my battery charger overnight. If battery continues to discharge, I'll assume converter is shot. May replace both battery (it's 5 years old) and the converter. Am assuming the shore power, which now runs all the electric lights and receptacles, is not the source of my converter issue.

[wrgrs50s]

When there are multiple issues at the same time, it's often hard to determine if they are actually related.

If you have power to the plug that your converter plugs into, then it must not be related to the breaker that wont re-set. If the converter fan comes on for a few seconds then back off, and is letting your battery drain then it surely is suspect. To test it, you need to get a multi meter as suggested earlier, disconnect the battery cables, and with the converter on check the voltage coming to the cables. They should read around 13.5 volts. If no voltage and your certain fuses on the back of the converter are good then it most likely is the converter has failed.

[Splashers3]

X2 about getting a multi-meter to measure the converter's output.

When by converter was dying in my 2009, the lights would flicker. When it finally died the output of the converter was zip....it was a very easy diagnosis.

[newman_fulltime]

Shore power runs the converter that charges the battery for the lights to work get a volt meter test the output of the converter and see what it is putting out instead of guessing at things