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02-11-2021, 11:48 PM
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#1
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Junior Member
Winnebago Owners Club
Join Date: Feb 2021
Location: las vegas nv
Posts: 22
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Battery replacement
recently changed coach batteries but they dont seem to hold a charge , gen charging and engine charging at bats, 2004 winn vectra , any ideas
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02-12-2021, 05:33 AM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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What kind of batteries, how many ?
What 12 volt things are you running ?
Battery cables wired correct ? Send picture.
Do they not hold a charge plugged into shore power ?
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02-12-2021, 06:02 AM
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#3
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Jul 2011
Posts: 3,887
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Beyond what twinboat posted also check the fuses at the output side of the converter/charger. No uncommon to blow the fuses when replacing the batteries.
__________________
2015 Newmar Canyon Star 3914
2006 Four Winds Hurricane 31D
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02-12-2021, 06:22 AM
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#4
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Senior Member
Join Date: Sep 2011
Posts: 564
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So you checked with a voltmeter, at rest and during charging? What did you get?
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02-12-2021, 12:32 PM
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#5
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Senior Member
Join Date: Jun 2012
Location: NorCal
Posts: 3,004
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Welcome to forum, we need a bit more info to help.
__________________
Outbound
2002 Monaco Executive 500 ISM
2004 GMC 2500HD 4X4
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02-12-2021, 04:29 PM
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#6
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Junior Member
Winnebago Owners Club
Join Date: Feb 2021
Location: las vegas nv
Posts: 22
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Quote:
Originally Posted by twinboat
What kind of batteries, how many ?
What 12 volt things are you running ?
Battery cables wired correct ? Send picture.
Do they not hold a charge plugged into shore power ?
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have not been able to try shore power yet, beleive all 12 volt off
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02-12-2021, 04:30 PM
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#7
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Junior Member
Winnebago Owners Club
Join Date: Feb 2021
Location: las vegas nv
Posts: 22
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Quote:
Originally Posted by TampaDave
So you checked with a voltmeter, at rest and during charging? What did you get?
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13.7 running from engine and gen,,9.6 sitting
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02-12-2021, 04:32 PM
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#8
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Junior Member
Winnebago Owners Club
Join Date: Feb 2021
Location: las vegas nv
Posts: 22
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Quote:
Originally Posted by Sweetbriar
Beyond what twinboat posted also check the fuses at the output side of the converter/charger. No uncommon to blow the fuses when replacing the batteries.
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will check fuses next
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02-12-2021, 04:46 PM
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#9
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Junior Member
Join Date: Jan 2021
Posts: 9
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The 13.7 voltage charging seems a little low, I checked mine recently and it was 14.0 volts. The resting voltage of 9.6 volts is too low. It should read about 12 volts resting.
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02-12-2021, 04:48 PM
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#10
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Senior Member
Forest River Owners Club Ford Super Duty Owner
Join Date: Feb 2021
Location: Metchosin BC
Posts: 472
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Quote:
Originally Posted by BJMac75
The 13.7 voltage charging seems a little low, I checked mine recently and it was 14.0 volts. The resting voltage of 9.6 volts is too low. It should read about 12 volts resting.
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As above. If it is "fully charged" and showing ~9.6-10V, that would most likely indicate one cell has collapsed in the battery.
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02-12-2021, 05:45 PM
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#11
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Senior Member
Join Date: May 2010
Location: Part-time out of Mesquite, TX
Posts: 1,103
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Quote:
Originally Posted by Saddltramp
13.7 running from engine and gen,,9.6 sitting
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Most wet cell batteries are considered to be discharged at 10.5V.
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02-12-2021, 06:11 PM
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#12
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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How long have the batteries been sitting without shore power ?
How long have you run the engine or generator to recharge them ?
The batteries are discharged. They will need about 10 hours of charging on shore power to get them back up.
If you can't get the rig to power, take the batteries to power, and buy a battery charger.
Once recharged,
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02-13-2021, 12:18 PM
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#13
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 28,511
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13.7v is normal for float charging, but that's meaningless because the alternator is supplying voltage as long as the engine runs. The "at rest" 9.6v is a totally dead battery. Anything at or below 10.5v is dead, i.e. 100% discharged.
So we know your house batteries aren't getting charged; the question is why. Many systems won't charge the house battery if the house main disconnect (Use/Store) switch is on the Off or Store position. Could also have a tripped circuit breaker on the 120v feed t the charger, or a faulty charger. It's easy to blow the converter/charger's reversed polarity fuses when changing a battery, so check those first.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is now West Palm Beach, FL
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02-15-2021, 07:20 PM
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#14
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Member
Join Date: Aug 2018
Posts: 61
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Multiple batteries?
Just a shot in the dark - do you have 12V batteries or 6V batteries hooked in series to get 12V? If you have 6V batteries, check the voltage of each battery. One of them is clearly bad.
__________________
98 Newmar Dutch Star Diesel Pusher, 38'
Spartan chassis - Toad: dolly/2005 Saturn Vue
Grand Ledge, MI
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