Might also want to check DC voltages in the trailer when on shore power is on - should probably be around 13 volts plus or so, and also check the voltage right at the battery connections to see that the reading is similar.
Then you could pull the shore power and after letting the charging system rest a while (hour or so?) check the DC voltage again at the battery connections.
With fully charged batteries, you should read about 12.7 volts - if down to about 12 .2 then you only have about half charge.
If there are problems with the batteries, before changing them, you might want to remove the connections and clean them as well as the battery posts down to bright metal and try charging again.
I know that my battery connections seem to get quite corroded quickly and this can cause problems.
I remove my batteries from the trailer and store in the garage when not in use, charging them now and then with a battery tender. Whenever I put them back in the trailer, I give both the connectors and battery posts a quick clean up with one of the special wire brusg gadgets designed for that purpose.
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Brian & Connie Mitchell
2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.
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