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| Re: [GMCnet] Battery and/or starting issues [message #189127 is a reply to message #189091] |
Sat, 03 November 2012 22:42   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma:
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Senior Member |
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Rob,
As per the GM wiring diagrams and my grounding seminar.
1. The engine battery negative cable should go to a bolt on the engine block.
2. The house batter Negative cable should connect directly to the the Aluminum body of the motorhome.
3. No battery should ever connect directly to the steel frame of the coach.
I could give you all of the reasons for this by I'm too lazy to type it all out. Just take my word for it or read the grounding seminar on the GMC Eastern States web site.
http://www.gmceast.com/technical/Burton_Grounding_GMC_Motorhome.pdf
Ken B.
| Robert Mueller wrote on Sat, 03 November 2012 17:10 |
Gene,
Does:
- ground from the battery to the engine
- ground from the battery to the frame
Mean:
- ground from the STARTING battery to the engine
- ground from the HOUSE battery to the frame
Regards,
Rob M.
USAussie - Downunder
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of gene Fisher
Sent: Sunday, November 04, 2012 1:31 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Battery and/or starting issues
read this set of info
http://www.gmcmhphotos.com/photos/g5493-gmc-cranking-improve-for-free.html
- engine battery should hook directly to the starter
- not good to crank thru the cut-off switch (370 amp draw)
- ground from the battery to the engine
- ground from the battery to the frame
good luck
gene
On Sat, Nov 3, 2012 at 7:06 AM, Kerry Pinkerton <Pinkertonk@mchsi.com>wrote:
>
>
> Trying to work through a few issues on the new coach.
>
> When we first looked at it, we had to hit the boost button to start it.
> NOTHING on the engine battery. Decided the mechanic had thrown the
> disconnect switch the wrong way.
>
> When we went to pick it up, the engine battery was very weak and wouldn't
> start the coach. Charged it a while at the dealer and it made some noises
> but we finally just hit boost and drove it home.
>
> Better noises when we got home after a 2 hour interstate run. Gauge
> showed 13V charging all the way.
>
> Been plugged in to shore power since. Engine battery still won't start
> the engine by itself. My meter showed 12.5V on the battery so I pulled it
> and took it to my local Advance. They tested and said it was not fully
> charged but the result was iffy. I've had it on the charger all night and
> will let them test it again today. This morning, my charger says the
> battery is at 100%. Whether it stays at 100% or will take a load is the
> question.
>
> The battery connectors looked clean and were tight. There is a large
> battery disconnect in the circuit that I have not bypassed to see if it is
> the problem. On the list to do.
>
> The other thing I noticed is that they battery cables are these common 4
> gauge things. I'm wondering if I should replace them with the heavier 2
> gauge wires. There are several wires that would need to be replaced if I
> go this route. Advance sells some of the heavier cables I need but some
> will need to be fabricated. They sell the wire (clear insulation 2 gauge
> copper) by the foot with solder on connectors or crimp on connectors. I'm
> thinking I'll go the solder on approach with shrink tubing.
>
> Since the house battery starts the engine fine, I assume that wiring is OK
> but I'll look at it also.
>
> The house battery is a fairly new 12V. The engine battery is a 5 year old
> 950Amp top of the line from Advance. Based on what I've read while
> drinking from the GMC firehose here, the hot setup is to put two 6V golf
> cart batteries in series for the house battery. If my engine battery is
> bad, I can pull the house battery and move it up front and go with two 6 V
> for the rear.
>
> Thoughts, suggestions, and comments please.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, The Lady, 403
>
>
> 76 Eleganza being rebodied as an Art Deco car hauler
> _______________________________________________
> GMCnet mailing list
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>
--
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
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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