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Old 06-23-2015, 12:01 AM   #1
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Quick question about charging coach batteries

I started the float with full batteries. I did not run the generator while on the road. I did however run the TV and fantastic fans and as a result my house batteries only show 30% charged by the end of the day. I thought the chassis alternator charged the batteries? Why would they be so low?
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Old 06-23-2015, 07:53 AM   #2
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I was told when we had our walk thru that the alternator would charge the house batteries. If you have a volt meter, get a reading on the house batteries then start the engine to see if it volts increase. If not, I would suggest they are not being charged by the alternator.
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Old 06-23-2015, 08:52 AM   #3
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I believe you cannot have your batteries in the storage disconnect mode for the charging to happen either via alternator/generator/shore power. Might check that they are not disconnected. Just a thought.
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Old 06-23-2015, 11:06 AM   #4
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The chassis alternator should recharge the coach batteries. Not sure what year your unit is but some earlier models like my 2012 had fuses omitted from the control circuit which prevented proper functionality of the recharge mode.
You can check battery voltage, start the chassis engine, wait a few minutes, ( I hear a clunk when the alternator closes in to the house batteries) and check the voltage again. If it's not higher then troubleshooting will be needed to find the problem.
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Old 06-23-2015, 02:58 PM   #5
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I believe you cannot have your batteries in the storage disconnect mode for the charging to happen either via alternator/generator/shore power. Might check that they are not disconnected. Just a thought.
Sometime in late 2014 they changed from the WFCO to the Progressive Dynamics. The WFCO could not be in the disconnect mode to charge the coach batteries. The Progressive Dynamics comes with the Charge Wizard and will charge the batteries either way. If you search on "Progressive Dynamics" in the Sunseeker forum (or Forester), many with the WFCO are updating to the Progressive Dynamics and it is not supposed to be that hard. I've seen enough posts that I'm leaning towards that too.
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Old 06-23-2015, 03:29 PM   #6
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I had a bad relay that prevented the alternator from charging while underway...May want to mention that to your shop. Fwiw...
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Old 06-23-2015, 03:46 PM   #7
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I was told by our tech during the walk thru that when under way, make sure you have the switch for the house batteries turned on or else they will not charge from the alternator. I know Steve has the same unit we have, a 2016 3171DS. Good luck Steve and let us know what you find out. We still haven't brought ours home since we bought it. Still in the shop for the passenger slide motor problem.
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Old 06-23-2015, 07:21 PM   #8
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Digital voltmeter check

Charging 14+
Not charging 12+
11- discharged
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Old 06-23-2015, 08:24 PM   #9
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Digital voltmeter check

Charging 14+
Not charging 12+
11- discharged
ACTUALLY anything over 13.2 means it is being charged. If it is heavily discharged...it will be 14+ as Harker notes and anything under 12 is heavily discharged OR discharging under current loads with damage to battery life being done. Measure AT the battery terminals.
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Old 06-23-2015, 08:53 PM   #10
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Charge from tow vehicle will typically hold battery 14+

A float charger will be about 13.2

Fully charged battery with no load 12.7

11 volts or less is pretty well discharged.
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