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Old 06-03-2016, 11:06 AM   #1
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Charging coach batteries from alternator

I have a Winnebago 2013 vista 26he and was wondering if anyone has fixed this problem of not charging coach batteries when engine is running. Also one question can I charge these batteries from them connect switch on the dash that connects all batteries to help on starting.
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Old 06-03-2016, 11:31 AM   #2
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Mine was doing that and it turned out to be the Bird switch.
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Old 06-03-2016, 11:56 AM   #3
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You worded your question oddly. Your coach from the factory DOES charge the batteries. If its not working now, you have something that has gone bad, like the BIRD. Often it can just be a fuse. You need to get it diagnosed.
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Old 06-03-2016, 07:04 PM   #4
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My coach has no bird
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Old 06-03-2016, 07:40 PM   #5
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Most likely the isolator solonoid has gone bad and the boost switch usually uses the same solonoid so that idea wont work. Depress and hold the boost switch on with a helper or use a button or beer cap and go check the coach batteries voltage. Anything lower then 13 volts will confirm the solonoids failure.
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Old 06-03-2016, 07:52 PM   #6
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My coach has no bird
Maybe not a BIRD but there is some kind of voltage sensing, battery combining system.

Many work in conjuntion with the solenoid that is controlled by the boost switch.

If your house batteries charge with the boost switch activated, then something is wrong with the small electronic module that activates the solenoid automatically.
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Old 06-04-2016, 04:20 AM   #7
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Maybe not a BIRD but there is some kind of voltage sensing, battery combining system.

Many work in conjuntion with the solenoid that is controlled by the boost switch.

If your house batteries charge with the boost switch activated, then something is wrong with the small electronic module that activates the solenoid automatically.
This currently applies to our coach. The electronic module ( small circuit board) kept failing so I decided to just use a beer cap to hold the boost switch on while driving. Btw technicaly it would be called an ird ( isolator relay delay) the b gets added ( bird) when both battery banks charge from shore power.
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Old 06-04-2016, 05:45 AM   #8
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I'm confused what are you calling a " beer cap" My a dash switch has to be held in by hand .
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Old 06-04-2016, 06:05 AM   #9
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I'm confused what are you calling a " beer cap" My a dash switch has to be held in by hand .
Some switchs are rocker style and can be jambed "on" with objects.

Not the best course of action because you may forget and run all of the batteries down.

If your batteries are not charging from the engine alternator, get someone to check the battery control center. They should charge while driving.
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Old 06-04-2016, 12:08 PM   #10
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Some switchs are rocker style and can be jambed "on" with objects.

Not the best course of action because you may forget and run all of the batteries down.

If your batteries are not charging from the engine alternator, get someone to check the battery control center. They should charge while driving.
Yes make sure the beer cap or whatever you use to hold the boost rocker switch open is removed after you shut the engine down. I place the beer cap into position after a few minutes of idling just as the automatic switch would do. It waits for the chassis batteries to reach the appropriate voltage then opens the switch to charge the house batteries. After the beer cap I place the antenna reminder over the transmission pad so that I dont forget to remove the beer cap. Its a " dont send a cheap circuit board to do a mans job" kind of thing.
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Old 06-04-2016, 10:09 PM   #11
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Btw technicaly it would be called an ird ( isolator relay delay) the b gets added ( bird)

I'm guessing the b that gets added is for 'battery'...
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Old 06-04-2016, 10:33 PM   #12
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My coach has no bird
Yes you do. Please see the 12 volt body wiring diagram here: Table of Contents

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Old 06-04-2016, 10:42 PM   #13
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Bird = bi directional isolator relay delay
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Old 06-04-2016, 10:52 PM   #14
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BIRD file info and a file on batteries and other RV electric devices.
Attached Files
File Type: pdf BIRD.pdf (105.0 KB, 35 views)
File Type: pdf Bird system info.pdf (1.54 MB, 28 views)
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