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09-25-2018, 10:59 AM
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#1
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Junior Member
Join Date: Oct 2017
Location: Fall River
Posts: 8
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Battery Issue
Well, I never thought I'd do it, but I did. The other day I hooked up the battery backwards. It blew the fuse and I replaced it. Went camping and hooked up to shore power. Everything worked. Came home. Next morning, battery almost dead. Charged it. Replaced in camper and dead in 12 hours. Did I trash the battery or did I screw something up in camper?
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09-25-2018, 11:27 AM
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#2
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Senior Member
Join Date: Nov 2011
Location: Where ever the boss says we're going.
Posts: 16,113
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There are 2 reverse polarity fuses in the converter if I remember correctly. Check those.
__________________
 DISNEY LOVERS
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09-25-2018, 11:32 AM
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#3
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Senior Member
Join Date: Dec 2014
Location: FL
Posts: 11,281
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Questions, questions, questions... 
How old is the battery?
Did you store the battery fully charged while it was out of the camper?
Was the battery fully charged when you installed it backwards?
After you charged the battery, was battery power OK in the camper?
What was the battery voltage when you installed it?
How did you determine the battery was dead in 12hrs? What was the battery voltage?
Are you sure no lights, fans, etc. were left on?
__________________
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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09-25-2018, 11:51 AM
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#4
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Senior Member
Join Date: Jun 2016
Location: Newburgh
Posts: 6,307
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Quote:
Originally Posted by oldmanAZ
Questions, questions, questions...
How old is the battery?
Did you store the battery fully charged while it was out of the camper?
Was the battery fully charged when you installed it backwards?
After you charged the battery, was battery power OK in the camper?
What was the battery voltage when you installed it?
How did you determine the battery was dead in 12hrs? What was the battery voltage?
Are you sure no lights, fans, etc. were left on? |
Hey Oldman, Any chance you are an attorney??? 
__________________
2022 33RBTS
Progressive Industries EMS - Hardwired
Equalizer 4 Point WDH
2021 Ford F350 7.3
Air Lift Rear Bags w/ On Board Compressor (Pending)
2016 28BHBE - (Traded and Missed already)
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09-25-2018, 12:12 PM
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#5
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Junior Member
Join Date: Oct 2017
Location: Fall River
Posts: 8
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Battery is a year old. It was fully charged when I accidently hooked it up. Power was O.K. in camper. Everything worked fine. Slide closed, awning retracted, etc. Got to campground and used shore power the whole time. Drove home. Next morning could barely retract awning and slide out. Checked battery with voltmeter. Had 10.7 on voltmeter. Took it back out and charged it. It charged to 12.7. Next morning, battery only had around 10.7. No lights or fan or refrigerator running. If the battery is charged again and left out without hooking it up to travel trailer, will it deplete itself if battery is bad?
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09-25-2018, 12:15 PM
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#6
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Senior Member
Join Date: Dec 2014
Location: FL
Posts: 11,281
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Quote:
Originally Posted by Marcm157
Hey Oldman, Any chance you are an attorney??? |
No, but maybe I had 1 too many cups of coffee this AM. 
__________________
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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09-25-2018, 12:20 PM
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#7
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Junior Member
Join Date: Oct 2017
Location: Fall River
Posts: 8
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Thank you for replying. If the converter fuses were blown, would everything work on travel trailer if just hooked up to battery power? When I hook up fully charged battery, slide works, awning works, lights, etc. It's just after about 12 hours or so just leaving the battery hooked up to my travel trailer that the battery is almost dead.
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09-25-2018, 01:52 PM
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#8
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Senior Member
Join Date: Mar 2018
Location: Chicago
Posts: 242
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Quote:
Originally Posted by Pezman
Thank you for replying. If the converter fuses were blown, would everything work on travel trailer if just hooked up to battery power? When I hook up fully charged battery, slide works, awning works, lights, etc. It's just after about 12 hours or so just leaving the battery hooked up to my travel trailer that the battery is almost dead.
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Yes. The reverse polarity fuse(s) just protect the charging circuit separately from the actual 12V feed into the unit. In all the trailers I've had, they're just regular automotive fuses found in the converter/main fuse box.
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09-27-2018, 08:06 AM
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#9
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Member
Join Date: Jan 2017
Location: Cleveland, TN
Posts: 87
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Be careful as you have several parasitic drains on the battery that can not be shutdown without disconnecting the battery.
Your thought on removing, charging and measuring is the way to go.
One thought on the charge, if you are truly reading less than 12 V, your battery is most likely dead.
__________________
Don & Donna (Innisfree & Riley)
The Beast (2016 Tundra, DC, 4WD, 5.7L)
The Leprechaun (2016 WhiteHawk 33RSKS)
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09-27-2018, 08:53 AM
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#10
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Junior Member
Join Date: Oct 2017
Location: Fall River
Posts: 8
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Thank you for the reply, NHstuckingGA. The problem started when I accidently crossed the battery cables. Even though the fuse by the battery instantly blew, I'm wondering if I trashed the battery. Like I said, the battery takes a full charge when I put it on my battery charger, but drains down overnight. I checked for lights possibly being on, made sure the antenna booster was off and looked at everything else. Still, battery drains down overnight. Looks like a new battery next Spring.
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09-27-2018, 09:04 AM
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#11
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Member
Join Date: Jan 2017
Location: Cleveland, TN
Posts: 87
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The parasitic draws I referred to are the fire/smoke detector, LP & CO2 detectors.
If the battery drains down overnight when not in the trailer, you have a short in one of the cells. Common occurrence.
New battery.
But keep camping! Any good luck.
__________________
Don & Donna (Innisfree & Riley)
The Beast (2016 Tundra, DC, 4WD, 5.7L)
The Leprechaun (2016 WhiteHawk 33RSKS)
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09-27-2018, 09:15 AM
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#12
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Senior Member
Join Date: Jul 2011
Location: Long Island, NY
Posts: 1,402
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There is nothing I can think of that would cause the battery to be trashed as a result of reversing the polarity and blowing the reverse polarity fuse. I'm guessing as someone else suggested that there is another fuse that needs to be replaced at the converter that is preventing the battery from being charged.
__________________
2018 Jayco 28RLS
2012 F-250 6.2L 3.73
Equalizer Hitch
Yamaha 2400ISHC
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09-27-2018, 09:42 AM
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#13
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Member
Join Date: Feb 2016
Location: LaPorte, IN
Posts: 96
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Charge the battery and then take it to some place like Autozone, Advanced Auto Parts, O'Reilly Auto Parts or a Battery store and have then do a load test. If it passes you have some type of load. Easiest way to find it is with the battery out, put an ohm meter across the battery leads and pull fuses till the load goes away.
There are other low power things that are always on like the CO2 detector, Smoke Detector, USB Charge ports. One of these may be shorted out.
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2016 JayFlight SLX
23RB with Elite & Thermal packages and 15K A/C
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