Originally Posted by heikkila31
Thanks for the ideas guys! Father in law replaced coach batteries and did not know where the cables went. Obvious were positive in and negative out. ALso ran two 6 volt in series. There were also 2 other cables coming in not labeled which i think were determined to be both grounds. We grounded those out to the main negative terminal. That is the only electrical work recently done.
I need some things cleared up here first.
Was everything working fine before FIL replaced coach batteries?
Were the batteries taken out, two 12v or two 6v? I do see they are now 6v and wired in series.
Is the chassis battery present and working fine to start the engine?
Everything works great on generator or battery power. As soon as you plug the RV into line power on a panel the kitchen, bathroom, and living room lights will not function correctly. Just by turning on a switch you can kill power to all lights, fridge, etc... (except back bedroom). By turning any switch off and on in those areas you can actually kill power and turn it on to the above areas including fridge.
Does that help?
No more than your first post. If all the 12v lights, fridge set to 12v (gas), water heater and furnace all work on just battery power, then the 12v system is operating normally and the two 6v batteries are wired correctly.
When you plug the RV cord into 120v shore power or run the generator (which is basically doing the same thing), this is when part of the 12v system fails. So, the ONLY connection present in the coach that connects those 2 systems is the converter. This points directly to the converter or at least the 12v system control board seeing the power coming from the converter instead of just the batteries.
At this point I cannot help further until you get a voltmeter, know how to use it and run the test I described in my last post. I would not plug the RV into shore power anymore. I would get a battery charger and connect to your coach battery to keep them maintained, as we don't know if the converter has been charging them. If you feel capable, remove the 12v leads from your converter and connect the battery charger set to 10amp in their place. Now I would check the coach for the same problem. If it's is gone, it's the converter, if not, it could be the control board. Just not enough info yet to be sure of anything.