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Old 04-21-2020, 02:29 PM   #1
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Brand: Thor Motor Coach
Model: Ace
State: New Jersey
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THOR #18631
Unhappy fully charged batteries stop working

Everything OK. Batteries fully charged and working fine. Go out one morning, and RV won't start and display shows batteries half charged. Put meter on batteries, show full charge. Plug into shore power, engine starts. Everything ok for several weeks. Happens a 2nd time. Plug in shore power, engine starts. Everything fine today. Not sure where to look to find problem. have Thor Ace 27.2

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Old 04-21-2020, 03:03 PM   #2
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THOR #15553
Are you turning off the Battery Disconnect Switch while in storage? Do you have a light on is some closet or compartment? There also is paracidic draws on the batteries. CO dect, LP dect, Radio etc.
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Old 04-21-2020, 03:25 PM   #3
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Model: 29h outlaw
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Can you start the rig by holding the emergency start switch?

Sounds like the chassis battery is dying. On shore power the bird is charging the chassis battery which lets you start the rig.
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Old 04-21-2020, 06:28 PM   #4
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Quote:
Originally Posted by Trkyte@msn.com View Post
Can you start the rig by holding the emergency start switch?

Sounds like the chassis battery is dying. On shore power the bird is charging the chassis battery which lets you start the rig.
Second the basis battery going bad. Our 2018 27.2 needed a new battery summer 2019.
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Old 04-21-2020, 09:30 PM   #5
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The house batteries lasted three seasons but the chassis battery lasted 30 months. I thought the step was going bad because the coach is always on shore power and the engine started OK. Before a trip I check the chassis water level and found one cell had water below the top of the plates (bad cell). With a new battery, the step again worked as it should.
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Old 04-22-2020, 08:10 PM   #6
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Brand: Thor Motor Coach
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THOR #18631
Quote:
Originally Posted by Trkyte@msn.com View Post
Can you start the rig by holding the emergency start switch?

Sounds like the chassis battery is dying. On shore power the bird is charging the chassis battery which lets you start the rig.
Could not start on emergency start. Started after shore power on for 5 mins or so. Started every day since as well with no shore power. Seems like some switch or relay cutting out because house batteries were fully charged when I put meter to them. Not sure where to look.
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Old 05-06-2020, 07:46 PM   #7
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THOR #9915
Batteries

Did you check the terminals. Loose or corroded terminals will act like that.
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Old 05-06-2020, 08:02 PM   #8
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https://www.thorforums.com/forums/f8/fully-charged-batteries-stop-working-21375.html

Are you checking the batteries with a multimeter or are you doing a battery draw test which shows you CA of your battery. Your battery may show you good battery voltage and not have the CA to turn the vehicle over!
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Old 05-07-2020, 12:05 AM   #9
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When you say your meter shows full charge what does that mean to you.. a battery with just 12v is dead... also did you load test them batteries may be able to hold voltage but without being able to push the amperage they are useless.
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Old 05-07-2020, 12:24 AM   #10
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And what batteries are you testing? The house batteries don't start the engine, the chassis battery does.

If your house batteries are well charged you should be able to push the Emergency start button for about a minute and then attempt to start the rig with the Emergency start button still depressed even if the chassis battery is too low to start the rig.
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