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Old 12-07-2018, 12:33 AM   #1
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Brand: Thor Motor Coach
Model: Axis
State: Kansas
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THOR #13631
Battery drain

We recently bought a gently used 2017 Thor Axis and have had issues with the chassis battery dying every 2-4 days. Our son tested it and found there is something drawing a few amps when everything is off. Just wondering if anyone else has dealt with this and can give us a clue where to look before we spend a lot of time tracing wires.
BTW - love this forum and have found it very helpful as this is our first RV.
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Old 12-07-2018, 12:38 AM   #2
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Model: Axis 24.1 Windjammer
State: Indiana
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THOR #7074
Welcome to the forum!! Have your son add a battery cut off knife type switch in the compartment!
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Old 12-07-2018, 01:01 AM   #3
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Model: Axis 24.1
State: Michigan
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THOR #1150
Hello, congratulations and welcome.

Yeah instead of wasting time to trace down a current draw most of us just put the knife disconnect switch on and disconnect the battery when storing the RV.

If you haven't already, download and read Ed's excellent crowd sourced Axis/Vegas owner's manual found here:
Link to Ed Felker's Vegas/Axis Manual
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Old 12-07-2018, 02:06 AM   #4
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THOR #13631
Thank you JaimeGeek. We discovered Ed’s manual early on and it has been a lifesaver!
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Old 12-07-2018, 03:26 AM   #5
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THOR #13631
He just ordered one for us - thank you!
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Old 12-07-2018, 02:17 PM   #6
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Model: Compass 24 TF, Mercedes
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THOR #11249
What chassis is your rig built on? If it's a Mercedes there is a battery disconnect built in just above the gas peddle (yeah I know it's diesel).. Mine is the Mercedes and I have the same problem with battery draw down but don't care to redo all my presets every time I want to use it so I hardwired a battery minder into my shore power and try to keep it powered up when ever possible.
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Old 12-07-2018, 02:25 PM   #7
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Quote:
Originally Posted by Brandy66 View Post
What chassis is your rig built on? If it's a Mercedes there is a battery disconnect built in just above the gas peddle (yeah I know it's diesel).. Mine is the Mercedes and I have the same problem with battery draw down but don't care to redo all my presets every time I want to use it so I hardwired a battery minder into my shore power and try to keep it powered up when ever possible.
His unit is an Axis which is built on the Ford E-Series (E-350, E-450) chassis.
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Old 12-07-2018, 07:09 PM   #8
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Brand: Thor Motor Coach
Model: '17-Vegas 24.1
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THOR #13362
It’s probably the Axxera radio drain which has been talked about frequently in this forum.
That is, the radio hooked up to the house batteries (along with the CO/LP leak detector) is always on and draining the battery.
The options you have (as discussed on this forum):
- utilize the house battery disconnect switch located in the battery bay (turn to off position)
Or
- create a separate disconnect switch under the front dash specifically for the Axxera radio, and also one for the CO/LP detector accessed under the passenger side of the bed on my Vegas 24.1
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Old 12-22-2018, 10:33 PM   #9
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Model: A.C.E 29.3
State: Ohio
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THOR #1620
Its the Axxera I am sure, on my ACE it does the same thing, I found the fuse that powers the radio (in the ACE it is back in the battery compartment attached to a solenoid. I unplug that if it is going to be sitting for any more than a couple of days. Hard to believe that a radio can drain a full size battery but it does, an amp an hour x 24 hrs x 4 days adds up, that is a 100 amps
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Old 12-22-2018, 11:57 PM   #10
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Model: 2015 Vegas 24.1
State: Pennsylvania
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THOR #2601
By chassis battery you mean the one in the engine compartment, right? The Axxera radio is connected to the house batteries AND the chassis battery. The house batteries provide current to operate the radio and the rear/side view cameras. If you leave your USE/STORE in STORE when driving you'll notice the radio won't work and the cameras don't operate.

The chassis battery is connected to the radio to provide current to keep the radio station preselects and the clock current. If the house batteries provided that function every time you put USE/STORE in STORE the radio preselects would go away and the clock would stop working.

So if your chassis battery is draining down check the radio connection. But to save yourself hours of aggravation trying to chase down an parasitic load I'd install the knife switch like suggested above.
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