Yep
battery charger it is.
This thing is wonky.
I followed the trouble shooting guide and it was showing an "over current" problem as described in the guide.
while trying to track that down,as per the guide, the converter started working!
got the fan running and everything.
However, I still need the battery connected for all circuits to be live!!!
Too much for me on a Sunday afternoon with nothing open anyway.
Hopefully we'll make out OK with the charger as backup, but I'm not sure but what the trailer system is charging OK.
Now ... make sure I've got enough beer packed!
Thanks for all the advice and help.
Loris