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Old 05-25-2020, 11:45 AM   #31
flybouy
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Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,714
Reading what the OP has written I would recommend you unplug from shore power, remove the battery and get it load tested. A battery with ab"shorted cell" can seemingly hold a charge for a short time period. If the water has boiled out of the battery then it's never going to be right again. Same thing goes if the battery has been discharged below 10 volts.

The truck's wiring will not supply the same amperage to charge the battery as the trailer converter. A heavily discharged battery connected to the umbilical to the truck will not charge that battery over a 2 hr drive. It could take 6 hrs or more.

Comments on the landing gear, slides, tongue jacks... these are loads that draw much higher amperage than the converter can supply. Therefore, operation of those devices should not be conducted without a fully charged battery connected properly to the trailer.

The only truly definitive test is either checking the acid in each cell with a battery hydrometer (about $10) or with a load tester (about $50, or free test at auto parts store). Don't assume a "new" battery (especially installed by the dealership) equales a "good battery"
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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