interior lights

[Bemota]

I'm having an issue with myinside lights. They ramdomly go from dim to bright. I have a WFCO 55 amp charger, that goes from 14.3 to 13.2, on a 1 minute cycle. I'm on 50 amp shore power at a campground, my EMS tells me that I'm drawing 118-120 volts and about 10 amps on each leg. Other than the coach lights, furnace and etc. I have a 12V electric cooler in the basement for DW's insulin. I think the charger is going further south then I am, thinking about replacing it, should I go to a 65 amp or larger? This is a keystone cougar 2011 326MKS I got used last May. I have 2 12V batteries that run everything for over 4 hrs when I turn the converter off. Should I stay with WFCO ? Whats better, any help would be great. Thanks, Dan

Sorry for so long !!!

[Bobbo]

Any auto parts store can load test batteries. Be sure the batteries are fully charged first, even if you have to put a stand alone battery charger on them.

Heck, if you were in TN, I would tell you to bring them to my house. I have a 500 amp carbon pile load tester.

[Bemota]

Thanks for the replies, I'm north of Oceanside ca. Where or who could load test batteries, I have to take a wall down to get to the converter to check it out. Thanks again, Dan

[time2roll]

Disconnect the battery and see if the voltage continues to fluctuate.
WFCO will run the Rv just fine with no battery... if it is working correctly.

[Old-Biscuit]

I have 2 12V batteries that run everything for over 4 hrs when I turn the converter off. .....:H
Two 12V should last 2 days.not 4 hours.

WFCOs are NOT the best but I would pull batteries and have them load tested first.

Lights getting bright then going dim and converter output fluctuating sounds like a converter going bad BUT could also be bad battery cell(s)