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Old 05-31-2023, 06:24 PM   #1
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Engine wonít start

We own a 2012 Thor Serrano 34M. We replaced our Chassis Batteries this spring. Everything was working until we tried to start it. It started to start and then quit. Now there is no power from the batteries to the chassis. Does anyone knows what could be the cause?

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Old 05-31-2023, 06:33 PM   #2
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Bad electrical connection to the battery
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Old 06-02-2023, 01:21 AM   #3
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Bad electrical connection to the battery
That's my guess as well. Check all the battery connections, clean them up and tighten them down.
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Old 06-09-2023, 08:33 PM   #4
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THOR #4442
When starting Motorhome all power disconnects from Batteries

I asked this question before, how do I troubleshoot to find the cause of this issue?
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Old 06-09-2023, 08:41 PM   #5
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A thorough well thought question including symptoms and timing is important.
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Old 06-09-2023, 08:50 PM   #6
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Be nice if someone could let us know how to troubleshoot the problem.
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Old 06-10-2023, 12:04 AM   #7
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Are all the battery connections clean and tight? Batteries fully charged?
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Old 06-10-2023, 12:29 AM   #8
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Does the motorhome actually start?
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Old 06-10-2023, 02:33 AM   #9
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I asked this question before, how do I troubleshoot to find the cause of this issue?
I recommend you go back to the original thread where you asked the question before and see what answers have been posted. I have merged your new thread with your original thread.
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Old 06-10-2023, 02:44 AM   #10
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Originally Posted by Gisela View Post
We own a 2012 Thor Serrano 34M. We replaced our Chassis Batteries this spring. Everything was working until we tried to start it. It started to start and then quit. Now there is no power from the batteries to the chassis. Does anyone knows what could be the cause?
It is a FED, so my guess is air in the fuel lines or a bad injector pump.
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Old 06-10-2023, 02:48 AM   #11
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I guess the moderators combined your posts. Put a meter on the battery and check it's voltage. If it is over 12 volts then the problem is probably not the battery. I'm not familiar with your coach but you may have a bad fuse in the starting circuit or the main breaker for the chassis battery may be popped.
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Old 06-10-2023, 02:57 AM   #12
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One call to a mobile tech.
It's sat 10 days with the same problem.
Spend the $150.
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Old 06-10-2023, 06:03 AM   #13
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Starting engine disconnected all Battery Power to chassis

We bought and connected Batteries. Everything worked until we started the engine, then the lights flashed on and off and the battery power died. What did go wrong? How can we troubleshoot it?
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Old 06-10-2023, 09:31 AM   #14
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Originally Posted by Gisela View Post
We bought and connected Batteries. Everything worked until we started the engine, then the lights flashed on and off and the battery power died. What did go wrong? How can we troubleshoot it?
Not enough information.

One thing I learned very early in life was when I did something and things did not work anymore go back a double check all your work. You should have taken photos with your cellphone before you disconnected anything. Chances are you connected something wrong or left something disconnected.

So when you turned the engine off did the power come back?

Are you talking about the house batteries or the engine battery?

Which battery (batteries) were you changing? House or chassis
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