Battery Charged backwards - Fiberglass RV


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Old 06-04-2013, 07:55 PM   #1
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Battery Charged backwards

Can you undo a charging mistake?
Like hooking the charger to the battery backwards?
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Old 06-04-2013, 08:19 PM   #2
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Did it explode?
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Old 06-04-2013, 08:21 PM   #3
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Nope. lol
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Old 06-04-2013, 08:43 PM   #4
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What kind of battery, how many amps, how long attached? Do you get a voltage reading with a meter connected to it correctly?

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Old 06-04-2013, 08:50 PM   #5
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Yeah so what happened? Is there a problem? Is the battery holding a charge? How old is the battery?
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Old 06-04-2013, 08:50 PM   #6
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Quote:
Originally Posted by carlkeigley View Post
Can you undo a charging mistake?
Like hooking the charger to the battery backwards?
You might check for blown fuse but other than that I have seen this a dozen times since Scamp uses black and white instead of red and black wires.
On a Scamp there is an inline fuse, Hopefully the same is true in your case.
Just replace the fuse and correct the polarity at the battery and things usually return to normal. Check the battery after a few hours to see if it is accepting a charge.
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Old 06-04-2013, 09:14 PM   #7
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Depending on the charger, but for instance, a Deltran battery tender, like I use for my motorcylce batteries, have reverse polarity protection. So if you hook it up backwards, the chearger sees that, and does not even attempt to charge it.
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Old 06-05-2013, 07:45 AM   #8
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Those warning labels are only for the company that sells them anyway. (Joke)
You do know if you charge your battery backwards everything will go backwards. Even the bulbs will suck all the lite of the camper. (joke)

Guy next door tried to jump start his BMW with the p to the n and I caught him before it blew. I think you are lucky, maybe the inline fuse helped you out. Why don't you take your battery to be tested at the part store? Might be time for a new one any how.
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Old 06-05-2013, 08:10 AM   #9
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If you reverse charged the battery, you can try draining it completely, then recharging at the right polarity. It might be scrap, but it is worth a try.
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Old 06-05-2013, 09:03 AM   #10
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If it is dead you could try a low trickle charge to the battery to see if it comes back. I drained an optima red top dead to absolute zero and trickle charged. I'm still using it 5 plus years later. It's at least from 2005 when I bought it. Point is batteries can take some abuse and if you are careful how you recharge them they might surprise you. I'm curious what it would due to a battery now. I'd be potentially more concerned about the charger and any electronics that might be have seen the reverse voltage. Though any positive voltage in the battery may have canceled it out at least in the equipments eyes. I'm not sure if reverse polarity would cause an over current but fuses only pop when excess current flows they don't know polarity.

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Old 06-05-2013, 10:54 AM   #11
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Think I got lucky this time.

Actually, it's the battery on my mower.
It's a new battery. Seems my batteries don't stay charged.
May have to have my charging systems checked out. I had
trickled charged (2amp) for a few hours. When it would only
click I knew something was wrong. Then I noticed I had hooked
the cables up backwards (again). The previous battery had a
bad cell so it needed replaced anyway. I recharged it at 10amp.
When I went out after dark last night, the mower started back up.
I haven't checked it today, we got more heavy rain. I was going
to finish with my commercial mower and the battery was dead on it
as well. After realizing what I did, I double checked my commercial
mower. Luckily I had it hooked up right [with my old charger]. It's
the new charger I keep hooking up backwards. (2X). Need to mark
the cables extra ways.

My blood pressure had dropped in the low 90's so may have impaired me.
Blood sugar down to 77 at one point. Maybe I should have wife finish mowing....LOL

Anyway. Being an ex-mower repairman you think this wouldn't happen.
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Old 06-05-2013, 11:09 AM   #12
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Why?
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Old 06-05-2013, 12:42 PM   #13
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I took my post off because the other person did too
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Old 06-05-2013, 12:45 PM   #14
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Originally Posted by carlkeigley View Post
T
Anyway. Being an ex-mower repairman you think this wouldn't happen.
LOL Carl there are lots of things that happen as I age that one would think shouldnt! The frequency of some of it is scary actually!!
Perhaps its time to label the battery to remember - I recently put a sticker on my trailers battery box regarding correct hook up as a reminder to myself and anyone else who happens to remove the battery.
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Old 06-05-2013, 10:55 PM   #15
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Exclamation

Another mentioned the use of Black for Positive and White for Negative in some rigs...It stumps me as to why some in the RV industry began utilizing residential/commercial code wiring colors.

The first thing i did in my battery bay in the Parkliner was to correctly rewire all in the bay to automotive standard red/positive and black/negative on the 12 volt side in the battery bay. (Yes i left the manufacturer's Black to + and White to - label with my own labels for the mods i did next to it). It was an easy afternoon project and didn't cost anything but some nice 8 gauge wire. No biggie. But sheesh! WHY??
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Old 06-06-2013, 09:39 AM   #16
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Originally Posted by accrete View Post
Another mentioned the use of Black for Positive and White for Negative in some rigs...It stumps me as to why some in the RV industry began utilizing residential/commercial code wiring colors.
Its not actually "some" its most manufactures these days, if they are following the RVIA code. The RV industry looks at an trailer as a dwelling not a vehicle as it has no engine.
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Old 06-06-2013, 10:32 AM   #17
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I admittedly dont know what the motorhome standards are but it makes sense if the manufacture is following the RIVA standard in regards to the dwelling component.

Standards whether you agree with them are not, are actually a good thing, it sure makes it easier for people to fix something if they know it was built/wired to a specific standard. Problems can arise in the future on a trailer that lets say for example has a RIVA sticker on it and whoever is working on it in the future assumes it has been wired to that standard ... only to discover (often after the damage is done) that someone made changes to the wiring after it left the manufacturer's yard.
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Old 06-06-2013, 10:41 AM   #18
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I do have to ask! What does a lawn mower battery have anything to do with a camper?
Because I have a few things to ask about my TV cable box and about my zipper on my work boats..
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Old 06-06-2013, 10:42 AM   #19
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I know the standard thingy/thought you've got going is correct Carol... i just wish the "Standard" had remained automotive...if it had wheels Ask any van conversion shop (that does not bow to RIVA hype) or professional auto alarm or stereo shop...they are all still seeing "Red" rather than "Black".

They are the ones most outspoken on the matter. If you go into our van conversion's wiring (professionally done) it is Red/positive following all the auto guidlines...until you get to the ceiling fan which has black as positive and white as negative from the factory. silly. ...red all the way to the black lead on the fan.

OH well, life goes on. At least i know what i'm doing in there and glad i'm not color blind!

And i luv you even if you might say Crick, when i might say Creek
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Old 06-06-2013, 11:22 AM   #20
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Originally Posted by accrete View Post
OH well, life goes on. At least i know what i'm doing in there and glad i'm not color blind!
And i luv you even if you might say Crick, when i might say Creek
Thom
hummm I suspect the Queen would suggest with humour of course that you meant to say "Colour" blind oh and I thought it was our neighbours to the south that called it a Crick...
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