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Old 09-30-2021, 03:16 AM   #1
Junior Member
Brand: Thor Motor Coach
State: Oregon
Posts: 7
THOR #23795
Battery discharge

New 2020 ACE 30.2 and my batteries will not stay charged. now they are dead so I canít put down the jacks or extend the slides. Replacing the batteries seems like a bad idea because something is draining the batts.

Any help or suggestions

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Old 09-30-2021, 03:38 AM   #2
Senior Member
MJC62's Avatar
Brand: Thor Motor Coach
Model: A.C.E. 27.2
State: Indiana
Posts: 1,664
THOR #14698
We put our jacks down with the engine running and the slides out AFTER we plug the coach in. Doing it this way insures the batteries get a charge by the alternator or the converter

Just for shoots and giggles is your use/store switch on when you try to extend the slides or the jacks?
2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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Old 09-30-2021, 04:40 AM   #3
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 12,783
THOR #7035
USE/STORE switch has no effect on levelers.

OP: How long does it take to drain your batteries?
Are you connected to SP?
Is your USE/STORE switch in STORE (battery disconnected) if not plugged into SP?

Maybe revisit this thread more often than your last thread?
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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Old 09-30-2021, 11:09 AM   #4
Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,554
THOR #20289
Beg, borrow or steal a clamp on DC ammeter and do this experiment:

Clamp it around the DC negative wire and measure the current and record it. Then one by one remove each fuse in the converter panel and record the change. Replace the fuse and go to the next. Then if there is a breaker for the generator starter use the meter to record its current. Then look for a #2 gauge or similar red wire connected to the battery but not a breaker which goes to the BIM and use the clamp on meter to record the current.

Once you have done all of this report the results.

Other than simple stuff like the use/store switch, it will take some investigation to get to the bottom of this.

FWIW my 2021 Axis draws 0.7 amps with everything off except the tankless water heater and 0.5 amps when i turn it off at its outside switch. With normal use of lights, device charging, etc. I use 25 amp hours every 24 hours and can go four days on my two 100 Ah AGM batteries.

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