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Old 05-28-2020, 01:30 PM   #9
javelin
Senior Member
 
Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 1,410
THOR #2631
Hi, well for some reason it sounds like your coach batteries were not getting charged from the alternator as you were driving. I am not actually sure if all Hurricanes were equipped with the RV Custom Product BCC (Battery Control Cabinet (or Center). If you have the BCC box (front engine bay, Driver side), then there are some components inside it that could fail, which would prevent your coach batteries from charging.

You could “confirm” no charging is occurring by running the engine (no shore or Gen on) with coach disconnect relay (use/store) “on” and use a voltmeter across your coach batteries. You should measure approx 13vdc or higher if the alternator is charging them. In fact the alternator output is typically over 14vdc, but if your coach batteries are badly discharged the charging voltage might be drawn down a bit by high charge currents for a while. A normal wet cell battery is about 12.6vdc fully charged; full discharge is about 11.9 vdc.
One note here is the electronics in the BCC senses voltage on coach and chassis batteries and will operate the interconnect relay (emergency start relay) automatically to connect chassis and coach batteries together after a few minutes, if working normally......so when you measure coach battery voltage with engine running, wait 5 minutes or so after starting the engine, to make sure the interconnect has time to operate (if it is working). You can also manually force the interconnect relay in the BCC to operate with the emergency start button by the driver seat.


OldWEB has provided some links in his response to more details on the BCC and its function. The schematic and writeup on the BCC is very useful for you (and all RVers with the BCC) to read through.
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