Most likely would be a bad cell in one of the batteries...did you measure the voltage when the charger was operating?
How old are the batteries? Are they both the same manufacturer and age/condition etc? Charging lead acid batteries in parallel requires them to be well matched...
Of course it could be a bad converter...and much less likely would be the breaker itself. Nothing is impossible, but start with the most likely.
Chuck
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2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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