Thor Forums

[gmc]

You drained the coach batteries...
Leaving the 'Use/Store' switch in 'USE' for extended period without shore power will do it every time... (Some find even in Store there is a drain...)
Plug in to shore power if you can - and it will charge the batteries.

If you want to use an external charger - fine too - leave the batteries connected in parallel.

To charge from shore power or genny - the 'Use/Store' switch must be in 'Use' position.

You may be able to start the genny while holding the 'emergency start' switch on dash... That ties the coach and chassis batteries together - to start the engine from coach - or genny from chassis - when needed.