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Old 11-25-2016, 04:48 PM   #1
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Brand: Thor Motor Coach
Model: Vegas
State: New York
Posts: 24
THOR #5629
Chassis battery problem

After a long trip to Fl. And a short disconnect our Chassis battery on our 2015 Thor Vegas was dead. We recharged it with the house battery and
moved it into storage and within a few days the battery was dead again. Need infor on how to find short, and/ or how difficult it is to replace the battery.
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Old 11-25-2016, 08:49 PM   #2
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Brand: Thor Motor Coach
Model: Four Winds 22E
State: West Virginia
Posts: 115
THOR #3119
I cant speak to the replacement issue but to troubleshoot the short if there is one you will need a VOM or volt, ohm, amp meter. If you are not familiar with measuring current you might want to leave this to someone else. You can disconnect the positive battery cable put your meter in the 10 amp mode and connect the meter between the + battery terminal and the cable end you disconnected. You will then be reading the standby or leakage current your unit is drawing with everything off. Then one at a time start pulling fuses and watch the meter to see when the current draw drops significantly.
That fuse feeds the problem circuit. Be aware that you must wait at least an hour after you shut everything off before you start the testing. Many newer vehicles computers run diagnostic testing even after the engine has been shut off. The meter may never read zero but it should be way down in the milliamp range. Once you have the circuit isolated you can put the fuse back in and start disconnecting each component or plug on that line until you see the current drop again and you will have located your problem. The actual fix after that will depend on what caused the issue.
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Old 11-25-2016, 08:51 PM   #3
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Brand: Thor Motor Coach
Model: Axis 24.1
State: Florida
Posts: 611
THOR #4366
Review Ed Felker's Axis/Vegas manual thread.
His manual does a better job of how to change the battery.
1. You most likely don't have a short.
2. There are parasitic loads on both the house batteries and the cranking battery.
3. It appears from reports on this thread that Thor doesn't deliver these units with very good batteries.
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Old 11-25-2016, 08:51 PM   #4
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Brand: Thor Motor Coach
Model: 2015 Vegas 24.1
State: Pennsylvania
Posts: 1,304
THOR #2601
Chief -- you won't believe it but to change the chassis battery in the 2015 you will have to go through the top of the dash on the passenger side. You need to remove the computer desk and there is a cutout area you have to remove. I included the link to the Vegas/Axis owners manual I compiled. There is a description and pictures showing how to remove the chassis battery. The link to the manual is:
https://1drv.ms/w/s!AiYx6DLSeiiP6UNyy_VYGDO0BW6L
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Old 11-26-2016, 01:24 PM   #5
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Brand: Thor Motor Coach
Model: Vegas
State: New York
Posts: 24
THOR #5629
Thank you

Ed and Bev. That's what we were afraid of. Still haven't figured out if it's a short in the system or a bad battery. We have the RV in storage now so we haven't got a lot of tools at our disposal. My husband, Gerhard , is a retired stationary Engineer from NYC and is also mechanically inclined so he should be able to handle whatever it is...or not.
That manual is great. Thank you for sharing.

Happy travels.
Darlene and Gerhard
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