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post #1 of (permalink) Old 07-18-2007, 12:37 PM Thread Starter
 
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Bad Battery In A Dual Battery Set...

F*&#ing battery failure!

I use two batteries, a BCI group 24 and a BCI group 24F...
The same battery, except the terminals are reversed so my like poles stay together.

Well, this morning on the way to the gun range...
A plate let go in one of the batteries.
This isn't uncommon in off road vehicles, and I did get 5 years out of a set of 36 month, economy batteries so I shouldn't b!tch, but it was a pretty bad timing!

The biggest problem with running dual batteries with no isolator is you have to change them in pairs.
I guess I can find a use for the single good one around here... I just hate it when it ruins my plans for the morning!

So now I'm off to the parts store to get a set of new batteries...

No point to this post, just venting!!!!
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post #2 of (permalink) Old 07-18-2007, 01:48 PM
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Quote:
Originally Posted by Junk Yard Genius View Post
...The biggest problem with running dual batteries with no isolator is you have to change them in pairs...
Which is why I like using an isolator.
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post #3 of (permalink) Old 07-18-2007, 02:42 PM Thread Starter
 
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I don't like battery CHARGE isolators unless I'm running different ages or kinds of batteries, which I don't in the little jeep...
Just something else to go wrong, and charge isolators can consume up to 25% of the charge keeping your battery from ever getting fully charged...

Now, If I was running a winch a lot, or had a high drain device I needed a deep cycle battery for, then I'd run one, but by running both group 24 batteries, I don't really need a charge isolator.
---------------

Update...
Looks like it isn't a bad battery after all.
Alternator is putting out correctly, voltage and amperage, the batteries are fully charged and holding a load test well, so now it's looking like the volt gauge has taken a crap...

Glad it wasn't something expensive and serious!
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post #4 of (permalink) Old 07-18-2007, 07:37 PM
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I would check for a bad ground...............

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post #5 of (permalink) Old 07-18-2007, 10:55 PM Thread Starter
 
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I'm grounded 7 ways from sunday!

It turned out to be a snafu in the wiring causing a problem.
Glue oozed out of the heat shrink and made a fine insulator for one of my accessory relays...
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post #6 of (permalink) Old 07-19-2007, 06:54 AM
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How did that happen? Did you not pay attention when piutting it together, or did summer heat soften the glue and make it start moving?

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post #7 of (permalink) Old 07-19-2007, 09:53 AM Thread Starter
 
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I guess previous days of engine heat made things start moving around...
I use the heavy heat shrink with glue on about everything, and I'd never allow a piece of split heat shrink to stay in place, but when I found the problem,
(Had to take EVERYTHING apart at the solenoids to find it... )
The glue had oozed into the joint and the heat shrink had been over heated and split.

I suspected an overheated electrical connection,
SO,
I inspected the insulation and connectors, everything looked fine... Except for extra glue drooling out of some of the alternator charge connections, and the one split heat shrink...
...That pretty much told me the charging system was getting things hot...

That particular joint was missing any sort of compression washer, so I figure the stud they were mounted on heat expanded during operation, allowing the connection to become intermittent, and that will heat up a connection in a hurry on a charge circuit!

So I cleaned things up, patched things up, gave it a set of star washers to keep connection/tension in the joint and charged the low battery to fully charged and went ripping around town in it last night and this morning with no problems...

I'll probably take it apart again and inspect before I trust it out in the 'Boonies' but I have confidence that was the problem...

Sure mimicked a bad battery!
I could tell it wasn't an alternator failure (Field Test) because the 'Alt.' light would come on when I turned the key on, but go out when I started the vehicle.

Curious that the volt gauge decided to set on 8-1/4 volts, but didn't jump up when I started the vehicle...
So that let me know something was very screwed up...

Anyway, both batteries charged up fully,
The solenoids and battery isolator relay & oil pressure switch work just fine,
And now the stupid volt gauge seems to be working correctly... GO FIGURE!

Last edited by Junk Yard Genius; 07-19-2007 at 09:56 AM.
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