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Old 05-15-2023, 05:59 AM   #1
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Batteries not charging.

My batteries did not charge while plugged into to shore owner. They are charging when engine is running, any ideas?
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Old 05-15-2023, 07:42 AM   #2
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I suspect a bad fuse or breaker. Your converter box that takes in AC and turns into 12 volts to charge battery and run lights is the first place to look. It has both AC and 12 volt fuses. If ok, then go to battery and look for a fuse there or a loose/bad connection.

For best advice please post your make, model and year RV. Some have battery switches, cutoffs, etc. that could be the problem. Lots of past posts on motor homes with charge systems that are different from a regular camper.
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Old 05-15-2023, 02:32 PM   #3
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Thank you.
2018 31P Alante. The breaker under the bed labeled converter is no tripped. I recycled it just for kicks. Is the converter under the bed behind the breaker box? And you said it has a fuse there?
I just got to a campground after traveling all day. The batteries are fully charged now via the truck alternator.
If I put a meter on the house batteries while lugged into shore power, should I see something over 12.5 or 13.0 bolts of the converter is charging the batteries?
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Old 05-15-2023, 06:54 PM   #4
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Quote:
Originally Posted by KHabie View Post
Thank you.
2018 31P Alante. The breaker under the bed labeled converter is no tripped. I recycled it just for kicks. Is the converter under the bed behind the breaker box? And you said it has a fuse there?
I just got to a campground after traveling all day. The batteries are fully charged now via the truck alternator.
If I put a meter on the house batteries while lugged into shore power, should I see something over 12.5 or 13.0 bolts of the converter is charging the batteries?
Your converter may have some external reverse polarity fuses. These can blow if the battery cables are accidentally reversed momentarily.

Normal charge voltage is mid 13s to mid 14s.
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Old 05-15-2023, 07:26 PM   #5
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You are off base… no one removed cables, not the issue but thanks.
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Old 05-15-2023, 07:29 PM   #6
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You are off base… no one removed cables, not the issue but thanks.
I just mentioned the fuses because they are there. They are called reverse polarity fuses. Don't know if anything else can cause them to blow. You asked if there was a fuse there.
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Old 05-15-2023, 07:31 PM   #7
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Here is a troubleshooting guide for a typical converter.
Attached Files
File Type: pdf Converter Troubleshooting.pdf (75.7 KB, 18 views)
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Old 05-15-2023, 07:43 PM   #8
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Well, I finally put my troubleshooting hat on and figured it out. The fact that everything in the Coach that is 12 volt is working properly, lights etc. is proof that the converter is converting. I should have gone straight to the batteries with a meter (my best friend).
With the coach on shore power the batteries showed that there was 14.3 volts charging….��
Shore power disconnected, meter showed 5.7 bolts….��. Bad batteries…….
Replaced batteries….. all good.
Thanks for the suggestions.
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Old 05-21-2023, 06:53 PM   #9
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Did you run the batteries down very low and start your engine for alternator to charge them? If so, ther is most likely a 50 amp circuit breaker near your battery control contractors. Like 1” square black and thin. There is a very tiny button on it that resets it. Best wishes.
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Old 05-21-2023, 07:41 PM   #10
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No thank goodness the batteries were bad but not bad enough to cause the alternator to overheat.
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Old 05-21-2023, 07:51 PM   #11
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So, you have found your issue, or you think the 50 amps is too high for your alternator? I’m confused by the comment.
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Old 05-21-2023, 08:14 PM   #12
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Yes, I found the issue. The alternator is charging properly. The converter is working properly but the batteries were not taking a charge. I replaced the batteries and all is fine.
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Old 05-21-2023, 09:42 PM   #13
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Very happy you resolved the issue!
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