Sort of depends on how the electrical systems in your coach are wired, so this question probably belongs in the Fleetwood group rather than Freightliner.
Your batteries can be charged from either the engine alternator or the converter/charger, but not both at the same time. When both are active, as is the case with the genset and engine both running, your coach electrical system decides which one is connected to the batteries. I don't know which one your Expedition gives preference to, but a relay will be open for one charge source and closed for the other. When you shut the engine down, then only the generator-converter/charger path is active.
I'm not familiar with the Expedition electrical gauges, but wonder if the gauge you read was showing generator amp output only or perhaps reading some selected source which may change. The display on my American Tradition shows multiple sources, depending on what is currently active.
I'm going to link this to the Fleetwood board to see if anybody there has an idea.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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