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Old 03-09-2017, 12:52 AM   #1
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Brand: Thor Motor Coach
Model: Palazzo 33.3
State: California
Posts: 19
THOR #6377
Engine not charging house batteries

We drove for 6 hours and our house batteries are dead. Had to use the auxiliary start to start the generator. I suspect the "battery isolator controller". Does anyone know where it is on a Palazzo? Or any other ideas?
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Old 03-09-2017, 03:14 AM   #2
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Brand: Thor Motor Coach
Model: PALAZZO 33.3
State: Illinois
Posts: 57
THOR #5696
Did you have the STORE/USE switch in USE Otherwise they wont charge off engine OR shoreline...
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Old 03-09-2017, 07:14 AM   #3
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Brand: Thor Motor Coach
Model: Palazzo 33.3
State: California
Posts: 19
THOR #6377
The switch is on use. The inverter was running the frig. With the engine running, the voltage on the dash reads 13+ volts, but the house reads 12 something. It should read 13+ just like the dash if it were receiving a charge from the alternator.
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Old 03-09-2017, 01:24 PM   #4
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Brand: Thor Motor Coach
Model: Miramar 33.5
State: Florida
Posts: 46
THOR #5240
I had the same problem in a 2015 Miramar. Went in for warranty service on several issues and they fixed it. Now it is doing it again. I have another list of issues so this time I guess I should ask what they fixed that broke again.
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Old 03-09-2017, 01:45 PM   #5
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Brand: Still Looking
Model: Travato
State: Florida
Posts: 2,435
THOR #1765
I don't know what system Thor uses in the Plazzo but it sounds like you have a bad BCC (Battery Control Center). In the Axis the BIRD (Bi- Directional Relay) does the same things but in your large coach, you probably have a BCC or something similar which allows the engine to charge the coach batteries and shore power/generator to charge the chassis battery and disconnects them when the coach is not on shore power/generator and the engine is not running. Thor will be able to tell you what system in in your coach performs these functions.
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