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Old 06-12-2021, 03:54 AM   #1
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Default Accidently connected two 12 v batteries!

I'm a new owner of a 2007 RT 210. Recently, my friend helped me swap out my coach batteries, not realizing the two batteries were 6 volts. He put in two 12 volt batteries in series. A few of the lights blew out and the fridge fuse blew before I realized something wasn't right! He disconnected one battery and now the system seems OK ( lights may need to be replaced.. Bulbs certainly will). Do I need to have the electrical system examined? What, if anything, can this cause?
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Old 06-12-2021, 04:03 AM   #2
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Probably the damage is done and nothing more bad happened. But lesson learned about series vs parallel.
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Old 06-12-2021, 10:50 AM   #3
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Originally Posted by rowiebowie View Post
Probably the damage is done and nothing more bad happened. But lesson learned about series vs parallel.

As long as you check everything that is connected for function and they work, you should be OK. This would include all the TV and radio stuff that might be hooked up, device chargers, shore power charger, even the charging separator from the engine charging, ceiling fan. There are a lot of 12v things in a class b.


Good luck, hope you come out well.
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Old 06-20-2021, 05:09 PM   #4
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In addition to what was recommended, I would go through the fuse panel and check each fuse. Hopefully, the fuse saved any component that was on at the time the 24 volts shot through the system.

Once you're sure everything is good to go I would:
1. Keep the 2nd 12v battery and hook it up in PARALLEL to double the available amp hours.

2. Become friends with OHMs Law.
3. JMO Don't ask that friend to help with anything electrical again.


Good luck and happy motoring.
Chief P
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Old 06-20-2021, 07:03 PM   #5
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Probably the 2 6V battery's where placed in serie, so system is 12V.
Then you can also place the 2 12V battery's parallel, and dont need to store the 12 V left over.

In Europe, where I live, only 12V is used for cars and 24V for Trucks.
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Old 06-20-2021, 10:03 PM   #6
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Quote:
Originally Posted by Chief P View Post
In addition to what was recommended, I would go through the fuse panel and check each fuse. Hopefully, the fuse saved any component that was on at the time the 24 volts shot through the system.

Once you're sure everything is good to go I would:
1. Keep the 2nd 12v battery and hook it up in PARALLEL to double the available amp hours.

2. Become friends with OHMs Law.
3. JMO Don't ask that friend to help with anything electrical again.


Good luck and happy motoring.
Chief P

Ha Ha... I know! We purchased the correct gauge adapter and set them up correctly in parallel. All good!
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