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Old 12-01-2014, 04:33 PM   #1
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Drove Home 8 hours and battery is only showing half charge

I have a 2012 Flying Cloud. I'm new to all of this.

A couple of questions on the battery. I just had it hooked up over the Thanksgiving weekend. I then drove home 8 hours. It is 40 degrees. Everything was off last night in the store mode. I checked the battery today on the status monitor and it was showing half a charge.

Is this just due to the colder weather? Shouldn't the batteries be virtually 100% charged?

Going the other direction I took the A/S from storage and drove it 8 hours and thought it would get a charge from my F150 yet when I checked the status it just showed 1/2 to 3/4 charge. Now perhaps the status indicator never shows higher than this, but I'm wondering if something isn't working properly.

I figured my battery would get more of a charge from my F150 hookup and also wouldn't drain anything sitting over night in the store mode.
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Old 12-01-2014, 04:44 PM   #2
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You really do not get much of a charge while pulling the trailer. Explanations are that the wires between the truck and the trailer are too long and too small to maintain enough voltage differential to charge. And that the voltage regulator in the truck sees the charged starting battery in the truck so it tapers down to keep from overcharging that. Bottom line is I have never been able to do more than about a 1/2 or 3/4 charge while driving no matter how far.

As far as loosing charge while stored. I expect there is a small draw from some type of gas detector. It is not uncommon to have the water pump cycle if it is on. There are lights in the storage compartments that can be on. Did you use the jack in the cold to raise and lower it? Was the fridge on? Water heater? Little indicator lights on the dash?

On my older trailer the status monitor seems to show a little low. The only way I can keep it green is if I am actually hooked to power. I bought a little digital voltmeter that plugs into a 12 volt socket to keep plugged in the the bathroom to check the battery status. I would try one of those and check the actual battery voltage.

Is it a new battery/batteries or the one/ones that came from the factory in the trailer. If they have not been replaced the original batteries would be beyond where I would expect them to be good by now.
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Old 12-01-2014, 04:48 PM   #3
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For some reason 4 amps sticks in my mind as the amount of charge going through to the trailer. Also with colder temps the usable capacity of the battery drops, but it will take a charge better.

Aaron
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Old 12-01-2014, 04:51 PM   #4
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I measured mine and found with a Chev 2500HD I got 10 effective amps to the batteries. It was close to 14 amps total, but you are feeding any "on"items as well, like the fridge, radio head, propane detector, etc.
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Old 12-01-2014, 05:08 PM   #5
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Do not know about your TV but with Tow/Haul on my Chevy the alternator runs at a higher voltage providing more charge to the trailer. Otherwise, I would suspect not much charging while towing.
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Old 12-01-2014, 05:10 PM   #6
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I measured mine and found with a Chev 2500HD I got 10 effective amps to the batteries. It was close to 14 amps total, but you are feeding any "on"items as well, like the fridge, radio head, propane detector, etc.
This was without TH mode engaged. No need with a diesel in the flatlands.
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Old 12-01-2014, 05:26 PM   #7
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My 2010 F-150 has the tow package and was not delivered with the trailer charge relay installed. The relay came with the truck but had to be installed in the relay box on top near the radiator before the truck would provide charging to the trailer All the rest of the trailer wiring worked fine without it. There is a blurb in the owners manual on the subject...
My battery (a 210 amp hour group 4D) will go from 50% to full in an 8 hour drive easy. I use a real battery monitor rather than a volt meter to determine the state of charge though...
When the trailer battery is below 70% and it is hooked up to the running truck I have seen 18 amps going into the battery...
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Old 12-01-2014, 05:36 PM   #8
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As do I Bruce, and your findings are close to mine, you may be closer to 13 amps if you "re installed" 105Ah to the batts. The Tri-metric does count up from where you start by showing Ah from full.
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Old 12-01-2014, 05:51 PM   #9
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Awhile back we had parked our AS while visiting a friend in South Carolina. We had left only the refrig. on with some food in it. Sometime during the 4 days the batteries went dead due to the refrig. draw. We hooked up thinking things would be OK with the charge from the truck. I stopped a few times to check the status of the refrig. and found that it took about 4 hrs. driving for enough charge to just get the refrigerator going. Just to give you an idea of how little charge is produced while driving. More recently we were dry camping in Glacier NP. With careful use of electricity we were OK for 4 days. That was with new batteries.
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Old 12-01-2014, 06:02 PM   #10
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As do I Bruce, and your findings are close to mine, you may be closer to 13 amps if you "re installed" 105Ah to the batts. The Tri-metric does count up from where you start by showing Ah from full.
I am guessing the difference is in the size of my battery. The 4D is a big honking battery! The acceptance rate drops very quickly after the 80% point as do all batteries so that is why I specified that the battery had to be below about 70% to see that rate.

The other thing I forgot to mention is that my battery is a Lifeline AGM. Again higher acceptance rates than conventional lead acid batteries.

Cheers,
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Old 12-01-2014, 06:12 PM   #11
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Gotcha Bruce, but it still indicates a higher current delivery by the truck than I saw, unless my L/A batteries wouldn't "drink" all the available juice the truck was delivering. But I guess the bottom line is how much can you put in per hour of driving after normal dry camping. In my case I can put in an average of 10Ah per hour of driving. How's that for a stat from the Dept. of Redundancy Dept.?
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Old 12-01-2014, 06:24 PM   #12
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Wink

Our batteries were fully charged when we arrived in Simi Valley....

Bob
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Old 12-01-2014, 06:28 PM   #13
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Our batteries were fully charged when we arrived in Simi Valley....

Bob
From Buffalo?
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Old 12-01-2014, 06:33 PM   #14
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Our batteries were fully charged when we arrived in Simi Valley....

Bob
Isn't Simi Valley a lot of driving hours away from NY? I just googled Zanadude... Something about liking Olivia Newton John...I am confused! Glad you have full batteries though.
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