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Old 11-10-2012, 05:47 PM   #1
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Batteries.... 12 volt system or 24 volt

I have a 2006 Winnebago (40 footer). How can I tell if the chassis batteries are a 12 volt system or 24 volt system.

The batteries are connected in series.

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Old 11-10-2012, 06:34 PM   #2
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Quote:
Originally Posted by Zonkpdie
I have a 2006 Winnebago (40 footer). How can I tell if the chassis batteries are a 12 volt system or 24 volt system.

The batteries are connected in series.

Zonkpdie
If the batteries are 12v, they will have 6 cells each. So if wired in series, it would be 24v. It would not have 6v batteries for the chassis (3 cells), so that eliminates a 12v system if it is in series.

I seriously doubt you have a 24v system in an RV. I bet if you look closely, you'll see they are wired in parallel. Unless you think the coach batteries are the chassis batteries.
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Old 11-10-2012, 08:13 PM   #3
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The 2006 winnie is a 12 volt system.
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Old 11-10-2012, 09:16 PM   #4
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If you have two 12v chassis batteries connected in series, they are wired wrong. The Freightliner chassis under your 2006 Winnie uses a 12v chassis system.

Are you sure you aren't looking at the coach (house) batteries? They may be 6v batteries and wired into series pairs, with the pairs then in parallel if you have more than two of them.
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Old 11-11-2012, 06:38 AM   #5
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The cables on the batteries go from the positive post to positive ...same on the negative side.
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(Thank you all very much for responses.... very helpfull)
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Old 11-11-2012, 06:44 AM   #6
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Positive to positive, negative to negative = parallel.

Positive to negative with other positive and negative terminals as outputs = series.

2 each 6 volt batteries in parallel = 6 volt output

2 each 6 volt batteries in series = 12 volt output (typical for coach electrics)

2 each 12 volt batteries in parallel = 12 volt output (typical for chassis electrics)

2 each 12 volt batteries in series = 24 volt output


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Old 11-11-2012, 10:55 AM   #7
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Rusty, you forgot to mention 24 volt in 12 volt system = trouble!
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Old 11-11-2012, 02:12 PM   #8
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Quote:
Originally Posted by clyon51 View Post
If the batteries are 12v, they will have 6 cells each. So if wired in series, it would be 24v. It would not have 6v batteries for the chassis (3 cells), so that eliminates a 12v system if it is in series.

I seriously doubt you have a 24v system in an RV. I bet if you look closely, you'll see they are wired in parallel. Unless you think the coach batteries are the chassis batteries.
I have 2-6VDC batts in series. I have NEVER HEARD of or SEEN a 24V rig. If he looks he will see 2-6Vs in series.
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Old 11-11-2012, 02:38 PM   #9
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I have 2-6VDC batts in series. I have NEVER HEARD of or SEEN a 24V rig. If he looks he will see 2-6Vs in series.
I'm sure that will be the outcome. The only reason I entertained the 24v idea is because he has a diesel. I know big diesel trucks are 24v but as you, I've never heard of a 24v rig and I'm sure they don't exist. What I wouldn't bet my life on is, that a rig has a 12v house system and a 24v chassis system. Actually I think Prevost is that way. Of course I'm sure his Winnie isn't.
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Old 11-11-2012, 08:16 PM   #10
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Two ways... Best way.. Voltmeter, (Naturally).

Alternate method (Assumes you have no voltmeter)

Clean the tops of the batteries well so the markings and lines and such are very clear.

Take photo

Post photo

Make sure the connecting wires are inclueded in the photo.

It really is that easy to tell.
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Old 11-12-2012, 11:47 AM   #11
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I'm sure that will be the outcome. The only reason I entertained the 24v idea is because he has a diesel. I know big diesel trucks are 24v but as you, I've never heard of a 24v rig and I'm sure they don't exist. What I wouldn't bet my life on is, that a rig has a 12v house system and a 24v chassis system. Actually I think Prevost is that way. Of course I'm sure his Winnie isn't.
There should be a law that NO RVer can operate the rig without owning and having working knowledge of a VOM.

I am constantly amazed at the lack of understanding of simple automotive electrical systems.
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Old 11-12-2012, 12:15 PM   #12
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There should be a law that NO RVer can operate the rig without owning and having working knowledge of a VOM.

I am constantly amazed at the lack of understanding of simple automotive electrical systems.

I am very strongly inclined to agree with that...

Actually there is (or was) such a law, from what I have been led to believe.. But not in the United states.

One of the requirements for obtaining a driver's license in at least one former country was the ability to do a major overhaul on the car, You had to actually dissassemble, re-assemble and start the car to show you knew how to fix it if it should break down.. Now that country is history, but it's member states, are still about, and they may have kept the law.

That was, by the way, The United Socialist Soviet Republic.
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Old 11-12-2012, 12:33 PM   #13
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Quote:
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There should be a law that NO RVer can operate the rig without owning and having working knowledge of a VOM.

I am constantly amazed at the lack of understanding of simple automotive electrical systems.
I absolutely agree with hamguy, I can not even begin to think of the number of times I have said "a VOM is your friend". I would be willing to bet 90% of electrical problems reported here could be easily diagnosed with VOM.
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Old 11-13-2012, 06:27 AM   #14
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I apologize to all for my ignorance. I'm new at motor homes, we have always had fifth wheels and I'm knowledgeable of those. It's a learning curve and I'm grateful for your input.
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