| Recharging starting battery [message #340236] |
Mon, 21 January 2019 19:32  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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I know I was told I could charge my starter battery from my isolator, just don't remember which post on there I clamp to while I'm plugged in?
Thanks in advance!
Tom
76 Eleganza 2
KCMO
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Recharging starting battery [message #340239 is a reply to message #340236] |
Mon, 21 January 2019 20:31  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Tom,
Clipping across the OUTER two terminals of the isolator, or the two large
terminals on the boost relay, will connect the chassis and starting
batteries directly in parallel.
The caution to know is that either battery, if discharged, will take the
other one right along with it. If you're boondocking and use up "all" of
"the" battery, you'll have to jump start the coach. You MAY have enough
energy let you start the Onan, which will then allow your converter to
eventually recharge both batteries (while they're still connected).
HTH,
Ken H.
On Mon, Jan 21, 2019 at 9:03 PM tom geiger wrote:
> I know I was told I could charge my starter battery from my isolator, just
> don't remember which post on there I clamp to while I'm plugged in?
>
> Thanks in advance!
> Tom
> 76 Eleganza 2
> KCMO
>
> _______________________________________________
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> Unsubscribe or Change List Options:
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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: Recharging starting battery [message #340256 is a reply to message #340236] |
Tue, 22 January 2019 13:30 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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While jumpering the top and bottom terminals. One word work of caution is in order. Use a small gauge jumper. (A 18 or 16 gauge Jumper is all that I needed to carry charging current which will be low. If one of the batteries were to internally short, having a heavy wire will allow high current to flow between the batteries and usually blow up one of them. A thin jumper on the other hand will simply burn in half like a fuse and protect the two batteries. I have one of those jumper wires hanging unattached under the hood near the isolator just in case I need it. I have never needed it in 15 years but sometimes I install it when the coach is parked for months over the winter. I do not remember if I put it on this winter not.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Recharging starting battery [message #340261 is a reply to message #340258] |
Tue, 22 January 2019 15:34 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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I put the jumper in to keep my batteries charged if when I am not going to
use the coach for a while and plug the coach in. My problem is that my
PD9270 shorted out and the light existence cord I used acted like a fuse
more than 2 months after I plugged it in last time. It did not trip the 20
amp breaker in my main panel or the 15 amp breaker feeding the PD9270. Now
the chassis battery and 3 house batteries are 0 volts. The Generator
starting battery is ok. That is the only battery I did not replace a year
ago.
John Phillips
75 Avion
Sacramento Ca.
On Tue, Jan 22, 2019 at 11:49 AM gene Fisher wrote:
> Or use a combiner
>
>
>
>
>
> On Tue, Jan 22, 2019 at 11:42 AM Ken Burton wrote:
>
>> While jumpering the top and bottom terminals. One word work of caution
> is
>> in order. Use a small gauge jumper. (A 18 or 16 gauge Jumper is all
> that I
>> needed to carry charging current which will be low. If one of the
>> batteries were to internally short, having a heavy wire will allow high
>> current to
>> flow between the batteries and usually blow up one of them. A thin
> jumper
>> on the other hand will simply burn in half like a fuse and protect the
> two
>> batteries. I have one of those jumper wires hanging unattached under the
>> hood near the isolator just in case I need it. I have never needed it
> in 15
>> years but sometimes I install it when the coach is parked for months over
>> the winter. I do not remember if I put it on this winter not.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
> _______________________________________________
> GMCnet mailing list
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>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: Recharging starting battery [message #340266 is a reply to message #340236] |
Tue, 22 January 2019 16:10 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Your start battery already charges through your isolator. You mean which terminal to clip on a trickle or something? Just trace the wires. Not a wise answer-- easy to follow
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Recharging starting battery [message #340278 is a reply to message #340236] |
Tue, 22 January 2019 20:32 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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I just remembered I had bought a Combiner several years back, and I'll just need to figure out where I put it. Sounds like the safer way to go. I do have a small gauge jumper wire I store near the battery, just have not used it for awhile.
So its on the hunt for where I stashed it.
Thanks,
Tom
Tom Geiger
76 Eleganza II
KCMO
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