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Old 02-21-2021, 10:46 AM   #1
Junior Member
 
Brand: Thor Motor Coach
Model: Hurricane
State: Kentucky
Posts: 8
THOR #19504
Question Chassis Battery

I have a 2019 Thor Hurricane 34R. Batteries have been staying up by themselves easy while stored in enclosed storage. Last Sunday drove 700 miles and have been connected to shore power here in Fla. Preparing to leave today I just noticed the chassis battery is at 11.7 volts while house are at the normal 13.2. I haven’t tried to start it yet but shouldn’t it be charging while under shore power? Battery has just gone bad or what? Thanks for your response

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Old 02-21-2021, 11:56 AM   #2
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Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,152
THOR #20289
It depends on what kind of battery isolation manager (BIM) you have. In recent years Thor has been installing Precision Circuits BIM 160 or 225 which charges both ways. Older systems, those often referred to as "BIRD, Trombetta" don't go both ways and need something like the Trik L Start to charge the chassis batteries.

But in any case your chassis battery shouldn't have dropped that much in a week. Look for a continuing load powered by the chassis battery like an interior light that may have pulled it down.

You should be able to use your Aux Start switch to get the chassis engine going even if the battery is near flat.

David

David

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