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Old 07-19-2016, 02:47 PM   #11
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Your house batteries are probably hybrid batteries that are a compromise between starting and deep cycle batteries. Automotive testers test the battery's ability to provide large amounts of current for a short time, what's necessary to start a vehicle. House batteries should be tested with a deep cycle tester, something that's not easy to find.

When I purchased my 2011 (new) Georgetown, the hose batteries were so dead that they wouldn't start the generator. On my way home from my first trip, I developed a wiring short in the hydraulic jack harness that put a constant 1-2A load on the house batteries and wasn't discovered until a few weeks later when I found a pair of totally discharged house batteries in the rig. After recharging the batteries, they tested "good" with an automotive load tester but I didn't believe the test results.

I built a deep cycle tester using a pair of auto headlights and ran a deep cycle test on one of the batteries which involved measuring the battery voltage every 15 minutes. I discovered that the batteries had less than 50% of their rated capacity. When I notified my dealer, he arranged replacements from FR under their new vehicle warranty.

I'm now ready for another set of batteries and will be replacing the 12V batteries with a pair of 6V golf cart batteries wired in series to give 12V. These are true deep cycle cells which are better able to withstand deep cycling and have over 25% more capacity than the hybrid 12V batteries that came with the rig.

Phil
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Old 07-19-2016, 03:42 PM   #12
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Look up my post about batteries draining...it was the 5A fuse running the fridge heater, this is most likely your problem! Let us know....
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Old 07-19-2016, 08:03 PM   #13
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I think the place to start diagnosis is at the batteries properly with a volt meter ON the terminals.
Plug in and take a reading. .should be minimum 13.2v and more likely 14.5v on a well drained battery. If not..you have a charger/converter or wiring issue.
If all is good...walk away for 12 or more hours AFTER making sure you've added distilled water to any low cells. If the plates in any cell are exposed...damage has been done to the batts.
After a minimum of 12 hours of charging...disconnect the negative battery wire and wait 24 hours. NOW take a voltage reading.
If the batts are good they will read 12.6-12.7. If there is some loss of capacity...12.4v. Anything below that and the batts capacity is seriously compromised & should be replaced with TRUE deep cycle batts.
If all checks out...it is time to look for hidden drains on the batts as some here have noted.
If nothing easy is found, an AC/DC clamp meter can run it down for you. I'll leave that for another post if you need it! 😀
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Old 07-19-2016, 08:38 PM   #14
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X2 on the voltmeter but I would also check the voltage when driving. If he drove 8 hours, the car alternator should have charged the battery unless there was something wrong with the battery center. My 2014 Sunseeker would not charge the house batteries because of a fault in the battery center.
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Old 07-20-2016, 06:03 AM   #15
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I have a Sunseeker, 2015 3910DS,
I got the same problem,
I could be two days connected to a camp site, charging. My batteries and still can't last one night, even when I conserved energy.
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Old 07-20-2016, 07:03 AM   #16
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A week or so back we boon docked @ a cousins place,,, MH sat all day,,, in the evening we put the 3 slides out,,, when we got up in the morning we did not have enough battery power to start generator,,, I had to run the engine so I could start generator...
I am sure running the 3 slides out took a lot of power,,, but thought I should still have some power left in the morning ???
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Old 07-20-2016, 09:34 AM   #17
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You might also check your trailer connection to verify you are getting the 12 volts through your plug to the trailer while traveling. Some vehicles do not come with that connection made up.
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Old 07-20-2016, 01:42 PM   #18
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Quote:
Originally Posted by genehorn View Post
You might also check your trailer connection to verify you are getting the 12 volts through your plug to the trailer while traveling. Some vehicles do not come with that connection made up.
The OP is talking about a Motorhome.
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Old 07-21-2016, 11:41 AM   #19
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So here is our update. Pulled the two batteries, seems one was shot the other tested okay. We chose to buy two new batteries. We are still camping while plugged in but should know what happens tomorrow night after we start our drive home. Batteries should get a good charge so fingers crossed.
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Old 07-21-2016, 11:50 AM   #20
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So just an fyi....I did the same thing, 1 bad battery, replaced both....still had the problem until I pulled the fridge fuse.....just sayin ;-) good luck!
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