OK...lots of time passed since my original post. Sorry to say I haven't had the time to solve it, but I have learned more as I continue to troubleshoot it.
The RV has a Magnetek 6300 series converter in it. I've learned that the house battery, engine, "shore" and generator power all come into this unit for distribution to the 12V RV system.
There are two 12V incoming leads to the converter. (red + and white -.) These come from either the running coach engine or from the house battery. There is a 3rd lead on this board (blue +) which comes from the converter when the generator is running or shore power is connected.
Putting a meter on the respective leads, I have 12V from the red/white terminals when the coach engine is running but 0V between red/white from the house battery (which is new and fully charged)if the engine is not running.
I also confirmed having 13.2V between the blue/white terminals when the generator is running or the RV is plugged in.
So there is something causing a disconnect between the house battery and the leads terminating on the converter board. A bit strange since with the coach running these same leads are powered. So it isn't a problem with a broken wire or connection.
I'm thinking there has to be a relay or solenoid somewhere in the system which is affecting the feed from the house battery but not the coach engine.
What it is and where it is...I haven't quite figured that part out yet!
It also appears that when the generator/shore power is being distributed (I have 13.2V between blue/white terminals at that time) this voltage is not "back feeding" the batteries to charge them. Between the red/white terminals with the generator running I'm getting less than 12V. A bit confusing...and I don't know if it's related to my main problem, or is another problem on top of it.
Suggestions, comments and pity are welcome!!!
