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Old 03-04-2017, 06:04 PM   #1
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THOR #2742
Thor factory installed batteries

Can anyone comment on the quality of the factory installed batteries on Thor Motorhome products? Poor, fair, good, excellent quality? How many years should one expect them to last? Many thanks in advance.
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Old 03-04-2017, 06:19 PM   #2
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Many people have claimed they got defective or very poor service from the Harris Batteries that come from the factory. Others have blamed the converter/charger installed by Thor for the short battery life. Harris has not helped its cause by denying warranty coverage of the battery, saying that the charger was the reason. I dont think the Harris battery is bad and mine is 2.5 years old and I have not had any problems but I would not buy another one because they refuse to stand behind their product with no proof just blanket statements. They dont have a test report they can point to and group all claims in the same charger basket.
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Old 03-04-2017, 07:20 PM   #3
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THOR #4735
mine have worked fine for 3 years.... no issues, just EQUALIZE them periodically
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Old 03-04-2017, 08:49 PM   #4
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THOR #1765
Search for "Harris battery" and I'll bet you'll see a ton of threads. People have bee having problems wit them sinc the Vegas first dam out in 2014. I replaced mine after a couple of years and my Sears have been better. I just replaced the charger/converter in my Axis npbecause it would not go on high charge or sustain charge.
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Old 03-05-2017, 12:25 AM   #5
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My Harris battery worked for about a season. I was able to nurse it for about 6 months after that; finally had to get rid of it because it wouldn't hold any semblance of charge.

Even my cheap replacement performs better than the Harris battery ever did.
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Old 03-05-2017, 12:34 AM   #6
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Jamie, were you able to replace your eng. battery thru the wheel well or thru the passenger side dash?
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Old 03-05-2017, 01:04 AM   #7
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The unknown batteries that are in our Axis are marginal at best. I get better results from when I use either the solar system or automotive style smart charger for charging them.
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Old 03-05-2017, 01:12 AM   #8
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Quote:
Originally Posted by mcr1010
Jamie, were you able to replace your eng. battery thru the wheel well or thru the passenger side dash?
Didn't replace the engine battery, replaced the house battery. Can't really see the chassis battery but I believe it is a Motorcraft battery and not a Harris one.

House battery was easy: just lift out of the step well.
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Old 03-05-2017, 01:33 AM   #9
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Crap - replaced before one year.
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Old 03-05-2017, 02:38 AM   #10
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Quote:
Originally Posted by scrubjaysnest View Post
The unknown batteries that are in our Axis are marginal at best. I get better results from when I use either the solar system or automotive style smart charger for charging them.
That may be because your converter/charger is not working correctly, as mine was not. I replaced mine and the batteries work a lot better if they are charged correctly.
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Old 03-05-2017, 09:19 AM   #11
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With almost 3 years on the used Thor we purchased our OEM 6-V batteries are working great. I initially was checking them every month for water levels and they barely used any and seem to hold a charge very well.
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Old 03-05-2017, 11:31 AM   #12
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THOR #5196
Harris batteries aren't the best and their warranty is useless. If you have a battery problem Harris will say it's the charger and will refuse to replace it!
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Old 03-05-2017, 01:34 PM   #13
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Originally Posted by Oneilkeys View Post
That may be because your converter/charger is not working correctly, as mine was not. I replaced mine and the batteries work a lot better if they are charged correctly.
That is why I don't use the WFCO, they are junk although this one works better then most as I have seen it at 14.2 volts and 10 amps for about 20 minutes.
Once the batteries are charged the WFCO seems to be a fair trickle charger.
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Old 03-05-2017, 02:30 PM   #14
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Originally Posted by TurnerFam View Post
mine have worked fine for 3 years.... no issues, just EQUALIZE them periodically


What does hat mean equalize the battery's. how do u do that?
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Old 03-05-2017, 04:25 PM   #15
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THOR #4735
on my Magnum remote panel, I press and hold the CHARGER button until the screen changes to EQUALIZE...

it basically 'overcharges' the batteries for about 4 hours, then goes automatically back to normal charge mode.

You will hear the batteries 'boiling' while this is happening, which is normal. Check and make sure you have the correct water level before starting, and check again after it's finished.

Of course, you can only do this if you are on 50a Shore Power...
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Old 03-05-2017, 05:03 PM   #16
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THOR #1469
Setups may be different between coach models and not all coaches have the ability to equalize the batteries without modification or replacement of the converter/charger.

The Palazzo has a Magnum charger while most of us have a WFCO converter/charger.
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Old 03-05-2017, 05:55 PM   #17
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Quote:
Originally Posted by allan cooper View Post
can anyone comment on the quality of the factory installed batteries on thor motorhome products? Poor, fair, good, excellent quality? How many years should one expect them to last? Many thanks in advance.
crap!
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Old 03-05-2017, 06:09 PM   #18
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Originally Posted by scrubjaysnest View Post
That is why I don't use the WFCO, they are junk although this one works better then most as I have seen it at 14.2 volts and 10 amps for about 20 minutes.
Once the batteries are charged the WFCO seems to be a fair trickle charger.
Mine would not charge above 13.6v and never went down to 13.1. Unless I am mistaken, the WFCOs will not equalize your batteries either. Mine never did.
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Old 03-05-2017, 09:10 PM   #19
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THOR #3920
Just my $.02 here.

I never used the standard batteries. I was told by Thor reps to change out the factory batteries before taking delivery. Thor says they just use cheap batteries that will work, but aren't the best. It as recommended to buy higher end 6V batteries, preferably 4. I upgraded mine once the RV arrived at the dealer before taking possession.
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Old 03-05-2017, 11:53 PM   #20
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THOR #1944
Quote:
Originally Posted by Allan Cooper View Post
Can anyone comment on the quality of the factory installed batteries on Thor Motorhome products? Poor, fair, good, excellent quality? How many years should one expect them to last? Many thanks in advance.
The factory batteries have the deck stacked against them. They are typically exposed to poor conditions in assembly to the brutality of a sales lot. Deep discharge is hard on them and even just once can substantially diminish capacity/life.

To get maximum life out of a FLA marine deep cycle battery, cycle only to about 50% and keep the cells properly filled. They can sometimes provide 5-6yrs of use.
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