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  Topic Review (Newest First)
08-26-2021 04:20 AM
Delta0
Quote:
Originally Posted by Jeepsmsc2 View Post
Update; I'm the original poster.

I kept the AGM battery in place as it was working.

I noticed a bit of fluctuation on the dash "voltage indicator" during idle this week. So I took it to AutoZone for another free test. On Monday, the Autozone tester read "Bad Battery 12.39V Charge 69%". I came back on Tuesday for another test and it read "Bad Battery 12.51V Charge 76%"

You may have read about Sears closing down most of their locations. Advanced Auto picked up the Die Hard brand. The AGM battery was under warranty, so I swung by Advanced Auto and they gave me a free replacement Die Hard battery (a traditional flooded battery as they didn't have AGM in stock).

I've driven with the free replacement battery for a couple of days, so I swung back by Autozone for another free test. Their tester is able to test the alternator as well.

With the new battery, the test results: "Good Battery 12.72V Charge 100%"

But here is where it gets interesting: The alternator test reads: "Voltage Regulator Failed. Diodes Passed."

So the alternator is clearly charging the new battery to 100%. What is the impact of a failed voltage regulator? Do I need to replace the alternator?
I'd say Autozone's test was faulty Jeeps.

Even the best battery testers aren't 100%.
Then there's human error.

Now throw in that there are 2 types of regulator.
The old fashioned, chuck 14.4v at the battery sort.
And the new fangled "Smart" ones that do a 100 sums a second to work out what voltage the battery needs.

I expect your set up is smarter than Autozone's tester realised.
08-25-2021 03:37 PM
Jeepsmsc2 Update; I'm the original poster.

I kept the AGM battery in place as it was working.

I noticed a bit of fluctuation on the dash "voltage indicator" during idle this week. So I took it to AutoZone for another free test. On Monday, the Autozone tester read "Bad Battery 12.39V Charge 69%". I came back on Tuesday for another test and it read "Bad Battery 12.51V Charge 76%"

You may have read about Sears closing down most of their locations. Advanced Auto picked up the Die Hard brand. The AGM battery was under warranty, so I swung by Advanced Auto and they gave me a free replacement Die Hard battery (a traditional flooded battery as they didn't have AGM in stock).

I've driven with the free replacement battery for a couple of days, so I swung back by Autozone for another free test. Their tester is able to test the alternator as well.

With the new battery, the test results: "Good Battery 12.72V Charge 100%"

But here is where it gets interesting: The alternator test reads: "Voltage Regulator Failed. Diodes Passed."

So the alternator is clearly charging the new battery to 100%. What is the impact of a failed voltage regulator? Do I need to replace the alternator?
06-29-2021 02:30 AM
Delta0
Quote:
Originally Posted by ravenworks View Post
Seriously?

Dude,the Subaru forum is across the street.
I have more miles driving backwards than you do going forward.
The guy asked a simple question and I answered it

So I guess load testing batteries is a no go now and everyone should buy jump packs?

Yeah,Subaru is over there 👉
Thanks Ravenworks.
I think I asked a simple question.

I load test flooded lead acid batteries
by getting the owner
to crank their car for 15 secs.

If the battery shows 9.6v after 15 secs it just passes the test.
That pass voltage only applies to flooded lead acid batteries.
And, perhaps, gel batteries.

Unfortunately, I don't know what voltage to quote
for an Odyssey battery.

I hoped you would know the test,
and the pass voltage for an Odyssey battery.
06-28-2021 07:57 PM
ravenworks
Quote:
Originally Posted by Delta0 View Post

How should Jeepsmsc2 load test his AGM battery please Ravenworks?
Seriously?

Dude,the Subaru forum is across the street.
I have more miles driving backwards than you do going forward.
The guy asked a simple question and I answered it

So I guess load testing batteries is a no go now and everyone should buy jump packs?

Yeah,Subaru is over there 👉
06-26-2021 09:13 AM
Delta0
Quote:
Originally Posted by 97Mule View Post
If i know its going to stay idle for over a couple months i disconnect the ground on the battery... if not, i just leave it.
Thanks 97Mule
06-26-2021 09:03 AM
97Mule
Quote:
Originally Posted by Delta0 View Post
That's amazing 97Mule.

Do you take the IOD fuse out when you leave it?
Or disconnect a battery lead perhaps?
If i know its going to stay idle for over a couple months i disconnect the ground on the battery... if not, i just leave it.
06-25-2021 10:00 PM
Delta0
Quote:
Originally Posted by ravenworks View Post
Load testing the battery is the only solid method of knowing.
I just retired a Platinum that was 12 years old,performed perfectly, but it was long in the tooth and wasn't willing to trust it this season
How should Jeepsmsc2 load test his AGM battery please Ravenworks?

Who made your 12 year old Platinum please?

Jeepsmsc2 believes his Platinum battery wasn't made by Odyssey.
He quotes 2 warranty replacements in less than three years to support his claim.
What light can you shed there please?
06-25-2021 04:11 PM
ravenworks Load testing the battery is the only solid method of knowing.
I just retired a Platinum that was 12 years old,performed perfectly, but it was long in the tooth and wasn't willing to trust it this season
06-25-2021 10:53 AM
Delta0
Quote:
Originally Posted by Delta0 View Post
12.92v at my battery 2hrs after I came in Jeepmsc2.
After a maybe 12 mile trip.

It went out at 12.62.

I've added a chart showing voltage against charge for a Flooded Lead Acid - FLA battery.

I'll get the reading 24hrs after the car came.
Those 24hrs will give the surface charge time to soak into the plates.
.
12,71v 24hrs after it came in.
So, a .21V drop in that time.

Your AGM battery is likely to have dropped by .2v too Jeepsmsc2.
I'll leave you to work out the probable condition of your battery from the chart.
06-25-2021 08:27 AM
Bigrigr I have owned ALOT of vehicles over the years, and every battery I have replaced showed signs of deterioration before it failed(actual starting problems, like slow cranking). And I have never had to walk because one failed unexpectedly. You will know when its time, but 3 years might be only half of that battery's working lifetime. Pretend that you dont know what you know about voltages and percentages...does it start easily every time? Run it till it doesn't....
06-25-2021 01:20 AM
Delta0
Quote:
Originally Posted by nickfast View Post
12.5 after 24 hours, depending on ambient temp is plenty to start the rig.
Thanks Nickfast.

Is that for an AGM battery or a flooded lead acid battery please?
06-24-2021 01:35 PM
nickfast
Quote:
Originally Posted by Delta0 View Post
I'm with you there Nickfast, percentages and even voltages are aren't worth much when judging a wet cell battery's worth.

In your first para you say "Voltage is normal when running and 24 hours later ".
What do regard as a 24hrs later normal voltage please?

I'll be interested to see how your 24hrs later normal compares with what I get tomorrow.
12.5 after 24 hours, depending on ambient temp is plenty to start the rig.
06-24-2021 01:30 PM
underscore
Quote:
Originally Posted by Delta0 View Post
"Intense obsession" with its implication of mental derangement is a very nasty attempt to trivialize me.

What else should it be called? Oxford dictionary:
ob·ses·sion

/əbˈseSHən/

"an idea or thought that continually preoccupies or intrudes on a person's mind."
06-24-2021 12:33 PM
Delta0
Quote:
Originally Posted by nickfast View Post
I'm going to go ahead and say-if you are not running into any issues, your battery holds charge and starts the rig, voltage is normal when running and 24 hours later, your terminals are clean and tight (and NOT the emergency crap things that clamp around a bare cable!), I would not even blink at continuing to use a 3 year old battery. Wet cell or AGM.
Don't go crazy chasing someone's percentages. How is it working?
I'm with you there Nickfast, percentages and even voltages are aren't worth much when judging a wet cell battery's worth.

In your first para you say "Voltage is normal when running and 24 hours later ".
What do regard as a 24hrs later normal voltage please?

I'll be interested to see how your 24hrs later normal compares with what I get tomorrow.
06-24-2021 12:12 PM
nickfast I'm going to go ahead and say-if you are not running into any issues, your battery holds charge and starts the rig, voltage is normal when running and 24 hours later, your terminals are clean and tight (and NOT the emergency crap things that clamp around a bare cable!), I would not even blink at continuing to use a 3 year old battery. Wet cell or AGM.
Don't go crazy chasing someone's percentages. How is it working?
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