Thor Forums

[javelin]

Welcome to the forum. Do you have a chassis battery disconnect switch and a coach battery disconnect switch near the entrance door?

On the older ACE coaches there is a BCC (battery control cabinet/center) made by RV Custom Products mounted in the engine bay, driver side (picture is attached). The BCC contains both latching relays (coach and chassis) as well as the 50 amp re-settable mini breaker connecting the converter (battery charger) output to the coach battery disconnect. The BCC also contains the interconnect relay (emergency start relay) and a circuit board with the smarts to connect battery strings together under certain charging conditions. If you are on shore power and converter is working, but voltage across the coach batteries is not at least (as Beau advised), 12.8 or above, you have an open cct between converter and coach batteries somewhere (assuming good batteries). It could be many things.


I would first check the voltage (with a voltmeter) across the coach batteries. If they are quite low they will not operate the coach latching relay and might need to be charged by a separate car charger (one that can charge a fully discharged battery). It could be simply the 50 amp re-settable mini breaker inside the BCC that has tripped open (little grey square device in lower left corner of 2nd picture attached). Reset it by pressing the small black button on the mini breaker inside the BCC.......but be very very careful opening that critter. The BCC contains and connects many power systems for your coach and it is best to disconnect all power (batteries and shore) before opening the BCC.