If that fan keeps running, yes, you may just have a big load, but very often the batteries are already mostly used up. They are the big load and may not take or hold a good charge. Running the battery/batteries down to or below 11.9/12 volts takes a toll.
If these batteries were in the rig on a lot for length of time they may already be toast. Sales people are known to run em dead before charging and then not necessarily charging them well, at that.
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Tom48
In Sunny So Cal /w
Now in 2005 Holiday Rambler Ambassador DP and The Hot Air Balloon RESTLESS
NO MORE Tricked out
2017 Sandstorm 250 T.H.
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