Home » Public Forums » GMCnet » APC to the rescue
| APC to the rescue [message #257425] |
Fri, 01 August 2014 08:43  |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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My alternator over charged on a recent road trip unbeknown to me. Engine battery was ok, but the coach battery back by the generator took a beating. My battery posts have the type of post for clamping as well as a stud with a wing nut, the negative post with the wing nut burned a hole in the battery case the size of a quarter under the wing nut portion. My in line electric fuel pump also took a hit. But my dash wiring is still intact. I have a combiner, shouldn't that have prevented the batteries from over charging? Just asking.
I now have a voltmeter installed.
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] APC to the rescue [message #257427 is a reply to message #257425] |
Fri, 01 August 2014 09:00  |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Tough luck, Bruce. However, I think the burn hole is more likely to have been caused by a slightly loose connection at the wing nut. With such a situation, what should have been a very low resistance connection was quite a bit higher. The charging current would cause a high voltage drop across that resistance which COULD develop a lot of heat at the connection and the subsequent damage to the battery itself. I had a similar experience with the house battery of my travel trailer.
I suggest using an actual hex nut to replace the wing nut in the future.
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~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
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> Date: Fri, 1 Aug 2014 07:44:52 -0600
> To: gmclist@temp.gmcnet.org
> From: hartsgmc@gmail.com
> Subject: [GMCnet] APC to the rescue
>
> My alternator over charged on a recent road trip unbeknown to me. Engine battery was ok, but the coach battery back by the generator took a beating.
> My battery posts have the type of post for clamping as well as a stud with a wing nut, the negative post with the wing nut burned a hole in the
> battery case the size of a quarter under the wing nut portion. My in line electric fuel pump also took a hit. But my dash wiring is still intact. I
> have a combiner, shouldn't that have prevented the batteries from over charging? Just asking.
>
> I now have a voltmeter installed.
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
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| Re: APC to the rescue [message #257434 is a reply to message #257425] |
Fri, 01 August 2014 10:55 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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X2.
I had a similar failure on one of my 6V GC2's, but more than likely was due to excessive cranking the coach with boost on. My coach had a hot start problem... Luckily it only melted the post, and costco took it back at 13 months, one month after the warranty expired.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] APC to the rescue [message #257447 is a reply to message #257434] |
Fri, 01 August 2014 14:27 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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I might add that the house battery did boil over as my battery tray was
corroded after just cleaning and painting it.
Engine battery was ok.
On Fri, Aug 1, 2014 at 9:55 AM, Chris Choffat wrote:
> X2.
>
> I had a similar failure on one of my 6V GC2's, but more than likely was
> due to excessive cranking the coach with boost on. My coach had a hot start
> problem... Luckily it only melted the post, and costco took it back at 13
> months, one month after the warranty expired.
> --
> -Chr$: Perpetual SmartAss
> Scottsdale, AZ
> 77 Ex-Kingsley Featuring: 455, Power Drive, 3:21, Rockwell, Jim B QJET,
> Qbag. Now for Sale
> 2010 Nomad 24 Ft Travel Trailer
>
> Photosite: Chrisc "It has Begun"
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] APC to the rescue [message #257453 is a reply to message #257447] |
Fri, 01 August 2014 14:47 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Then I suspect a dead cell (or two) which would put ~ 14V across four or five cells. Sure to boil the battery dry. No effect on a good chassis/engine battery. Been there and done that, too!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Fri, 1 Aug 2014 13:27:37 -0600
> From: hartsgmc@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] APC to the rescue
>
> I might add that the house battery did boil over as my battery tray was
> corroded after just cleaning and painting it.
> Engine battery was ok.
>
>
> On Fri, Aug 1, 2014 at 9:55 AM, Chris Choffat wrote:
>
>> X2.
>>
>> I had a similar failure on one of my 6V GC2's, but more than likely was
>> due to excessive cranking the coach with boost on. My coach had a hot start
>> problem... Luckily it only melted the post, and costco took it back at 13
>> months, one month after the warranty expired.
>> --
>> -Chr$: Perpetual SmartAss
>> Scottsdale, AZ
>> 77 Ex-Kingsley Featuring: 455, Power Drive, 3:21, Rockwell, Jim B QJET,
>> Qbag. Now for Sale
>> 2010 Nomad 24 Ft Travel Trailer
>>
>> Photosite: Chrisc "It has Begun"
>>> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
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| Re: [GMCnet] APC to the rescue [message #257484 is a reply to message #257425] |
Fri, 01 August 2014 19:41 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bruce,
I agree with those who say your problem was more likely a high resistance
connection at the damaged battery.
That aside, no one answered your question about the combiner protecting
against high voltage. SOME of the Yandina combiners have a Blue lead which
can be connected to cause them to disconnect at 14.2 VDC. NOT ALL have
that feature, and it could not protect the battery (usually the chassis
battery) directly connected to the charging source. I think it's unlikely
you have that protection.
Also, if your alternator produced enough voltage/current to cause the
damage you describe, it should have also boiled the other batteries.
What charge voltage does the new voltmeter show? Generally if the
alternator ever produces overvoltage it's because of an internal failure or
disconnection of the external sense wire (which should NEVER be allowed to
occur with the engine running). And it's generally not likely to self-heal.
Ken H.
On Fri, Aug 1, 2014 at 9:44 AM, Bruce Hart wrote:
> My alternator over charged on a recent road trip unbeknown to me. Engine
> battery was ok, but the coach battery back by the generator took a beating.
> My battery posts have the type of post for clamping as well as a stud with
> a wing nut, the negative post with the wing nut burned a hole in the
> battery case the size of a quarter under the wing nut portion. My in line
> electric fuel pump also took a hit. But my dash wiring is still intact. I
> have a combiner, shouldn't that have prevented the batteries from over
> charging? Just asking.
>
> I now have a voltmeter installed.
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] APC to the rescue [message #257497 is a reply to message #257447] |
Fri, 01 August 2014 21:54 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bruce,
I had that problem and took my Ragusa front triple battery tray out and to help prevent the problem I:
1) cleaned the corrosion off with liberal amounts of baking soda
2) had it sand blasted
3) had it powder coated
4) painted it with several coats of auto body undercoating
That was two years ago and not a sign of any corrosion yet!
http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p33848-gmc-repair-philosophy.html
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Bruce Hart
I might add that the house battery did boil over as my battery tray was
corroded after just cleaning and painting it.
Engine battery was ok.
Bruce
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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