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Old 12-05-2016, 12:43 PM   #1
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Aux battery question

Have a 2016 fleetwood flair. Question, when parked at site and plunged into 110 shore power do you turn off the aux battery? Discovered that if I turn off the aux battery my main battery goes dead. Once I turn the aux battery back on it charges the main battery. Any suggestions.
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Old 12-05-2016, 01:51 PM   #2
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If plugged into shore power why would you want to disconnect the battery?
Not sure of all your specifics but presume you have lead acid batteries. They like being fully charged.
Also presume you have a BCC. That has solenoids in it that sense voltage. When the Aux battery reaches a certain state (charged) it then will allow charging of the chassis battery.
If plugged in I do not see any reason to disconnect the battery.
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Old 12-05-2016, 04:51 PM   #3
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Quote:
Originally Posted by Retchp8143 View Post
Have a 2016 fleetwood flair. Question, when parked at site and plunged into 110 shore power do you turn off the aux battery? Discovered that if I turn off the aux battery my main battery goes dead. Once I turn the aux battery back on it charges the main battery. Any suggestions.
Computerguy has it correct, leave yourbatteries connected while plugged to shore power. It will allow all battery charging and maintaining to operate as designed.

You should only activate the battery disconnects if the coach will be left unattended for long periods of storage without shore power.
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Old 12-05-2016, 05:02 PM   #4
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We also have a 2016 Flair 29T. You can pretty much turn the aux battery switch on and forget about it unless you are going to put your coach in storage without power connected. The switch disconnects the house batteries from the 12 volt distribution system, if you turn the switch off and are connected to shore power, everything in the coach will continue to work but the batteries will not be charged.

You do not have a BCC system, you have the newer Battery Isolation Manager by Precision Circuits. There is a little logic that determines when batteries get charged...

On shore power the converter provides power to charge your house batteries, once the house batteries reach something like 13.6 volts, the chassis battery (called the main battery on your status panel) will be connected and charged. If the aux battery switch is turned off, the house batteries will not be charged and the BIM will never see the house batteries get to 13.6 volts so it will never connect and charge the chassis battery.

While we are talking about battery charging, some of the 2016 Flairs were miswired at the factory causing the house batteries to not get charged by the engine alternator. There is an 'upgrade campaign' as REV calls it that fixes the issue. If your house batteries are not charging while you drive you may need to have this upgrade completed. REV refers to it as upgrade 160831REV.
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