01-19-2020, 09:26 PM
Brand: Thor Motor Coach
Model: 2013 ACE 30.1
Just a few comments in blue for consideration.
Originally Posted by Budman
Things are clear in your head but don't always make it to ur fingers!!! Let me try again.
No shore power hooked up
No generator running
No big engine running
Batteries 6 months old
Shore power had been on all nite
Batteries holding 12.8 to 13.1 volts
Since you did not have the "coach battery disconnect" (or use/store switch) in the "on" position, your batteries were probably not charging all night off the new converter as you thought. So I am surprised your coach battery voltages measured much higher than 12.6vdc (assuming light or no coach load all night; and they are standard wet cell batteries).
Like OldWeb said you "might" have the RV Custom BCC box controlling your battery systems. If you have both a coach battery and chassis battery disconnect switch by the door, you probably have this BCC. If yes, then the latching relays (one for coach and one for chassis batteries are in the BCC and are not easy (physically) to replace. There is good Youtube video on opening this BCC up for repair. If you don't have this BCC then I am not sure what your coach uses for battery control or where the latch relay is located.
With shore connected and use/store in the on position, what voltage do you measure across the coach batteries? Should be 13vdc or more typically if the use/store latching relay is closed and latched and converter is charging the coach batteries.
Turn on use store switch
Turn on lights
When you turn on the use/store latch relay you should hear one clunk sound. If you hear another clunk after the 15 seconds when the lights fail it might be that the relay is not holding.
Also, if you are on shore power only your converter should be powering the lights directly without the use/store being on. If not, then maybe that new converter is not connected or working correctly.
Lites burn 15-20 seconds
Lites shut off
Hopefully better. Thx, Dennis.