floor guy,
It would be nice to know make/model/year/engine etc. of your coach so that we can give possibly more accurate answers. Gas and diesel coaches in many cases, have different electrical setups, especially for coach and chassis battery charging.
And no, in many setups, the chassis battery(ies) DO NOT charge while on shore power or on gen power. Basically shore power and gen power is the same as far as the coaches 110VAC is concerned.
But, take Winnebago and Itasca for example. In the pre-'06 years, especially in the diesel rigs, neither brand provided for chassis battery charging while on shore power. Many owners would come back to their rigs after extended storage periods only to find the chassis batteries dead. And, some had them stored while plugged into shore power.
So, many took it upon themselves to install, what Winne and Itasca started installing from the factory in '06. And that was/is, the "Trik-L-Start" unit. It's a simple, self regulated device, NOT A BATTERY CHARGER, type thing. It's installed between the charging side of the coach batteries and, the chassis batteries. When it sees there's a 1/2 volt difference between the two sets of batteries, it kicks in and, allows SOME of the charging that's intended for the house batteries, to migrate over to the chassis batteries.
It's maximum allowance is 5 amps. But, in gas coaches, about 99.9% of the time, they have a "Converter/charger". Now, some, depending on how it's wired from the factory will, charge the chassis batteries too, when plugged in. Many, will not.
So, the first thing you need to do is, determine what you have for a shore power, house battery charging system, be it a converter/charger or, INVERTER/CHARGER (usually only diesels). Once you make that determination, then you can start analyzing if it's wired for charging both sets and, if it's wired properly and, if it's malfunctioning or not. Good luck.
Scott
