Dash Voltage reading vs Multimeter at Battery

[ShadowsPapa]

So now I’m wondering why I don’t see the Captain America symbol @12.1v ?? I’m wondering when that gets triggered

Voltage is low but calculated capacity is still within the criteria it uses.

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[ShadowsPapa]

Need to quit looking into the "why" when noting is faulting.

I'd be wondering why the battery voltage is so low.
Does he not drive it often enough? Are they short drives?
If frequent and long drives, perhaps the batteries aren't capable of being brought up to full capacity and need to be "watched".

I'd charge each independently with a good charger and go from there.
That's low voltage - and batteries don't last if they are constantly at 50% charge or less.

May be no MIL or warning lights, but an observant owner can prevent being stuck somewhere.

Batteries that low just aren't right. The system will accept and work with them, but it's an indication something is going on, could be vehicle, battery, or the owner (not driving enough)

 

[Maximus Gladius]

Need to quit looking into the "why" when noting is faulting.

Staying on top of it results in no faults,…ideally

 

[Stan H]

Not sure if the meter is being used to read the battery while the cluster is also on showing the voltage inside.

I will try that again this evening after it cools down a bit and see if the load reading with switch oncauses the meter to read that lower reading .

 

[Stan H]

Voltage is low but calculated capacity is still within the criteria it uses.

My Captain America shield came on . Thats what started all this crap

 

[Stan H]

After this eveing I will update and let ya know what I find out hope I aint too late for my Aux Battery already replaced that son of a gun once. What a pain to do too.

 

[Jaxmax]

So Stan at 132,000 miles puts some miles on his Jeep, Kevin in Canada is at about 80,000 KM guess and I think you both are starting to realize that your batteries are getting old and should figure out which one or both to replace. Meters being off a tenth or two is not the end of the world and I think it is where the readings are taken is likely the difference. I’m not a big fan of ESS and have it bypassed , still works if I want and aux battery is gone….Jack

 

[Stan H]

I'd be wondering why the battery voltage is so low.
Does he not drive it often enough? Are they short drives?
If frequent and long drives, perhaps the batteries aren't capable of being brought up to full capacity and need to be "watched".

I'd charge each independently with a good charger and go from there.
That's low voltage - and batteries don't last if they are constantly at 50% charge or less.

May be no MIL or warning lights, but an observant owner can prevent being stuck somewhere.

Batteries that low just aren't right. The system will accept and work with them, but it's an indication something is going on, could be vehicle, battery, or the owner (not driving enough)

My particular drruves are 65 one way plus 10miles usually on site and idle time

 

[Maximus Gladius]

My Captain America shield came on . Thats what started all this crap

Yup, I wouldn’t have looked at mine if you didn’t show me yours first.

 

[Maximus Gladius]

So Stan at 132,000 miles puts some miles on his Jeep, Kevin in Canada is at about 80,000 KM

Small correction here, I switched my Canadian metric display for good ol American numbers so it’s easier communicating to youal. So, in actuality, I’m at 127k km and @Stan H would be at 212k kms. He’s double me with the same 2021 truck.

This second engine is at about 100k km (60k miles) but the batteries have been upgraded in 2023, both of them. I’m starting to lean on the great idea of just punting that aux down the road. Still standing on the fence with one leg but the wind is blowing and I’m starting to teeter, arms flapping.

 

[Andy29847]

The dash voltmeter is near worthless as long as you have 2 batteries in parallel.

The multimeter reading means very little if you have 2 batteries in parallel.

When checking the volts level of a battery, any load will reduce the measurement.

In my experience, 12.4vDC is when the Captain America alarm starts to come in play. 12.4vDC is half life for a 12v battery in most situations. The alarm comes from thresholds built into the Jeep system.

Testing batteries is not simple. You need to remove the load from the battery, isolate the 2 batteries from each other, charge the battery, allow the battery to sit for several hors to bleed off the surface charge, and then you can test the battery. The best test is a load test, but you can't do this with a multimeter.

https://www.jeepgladiatorforum.com/...ery-with-a-premium-h7-group-94-battery.76866/

 

[Stan H]

youal

Lol, its y'all down in the south

 

[Stan H]

The dash voltmeter is near worthless as long as you have 2 batteries in parallel.

The multimeter reading means very little if you have 2 batteries in parallel.

When checking the volts level of a battery, any load will reduce the measurement.

In my experience, 12.4vDC is when the Captain America alarm starts to come in play. 12.4vDC is half life for a 12v battery in most situations. The alarm comes from thresholds built into the Jeep system.

Testing batteries is not simple. You need to remove the load from the battery, isolate the 2 batteries from each other, charge the battery, allow the battery to sit for several hors to bleed off the surface charge, and then you can test the battery. The best test is a load test, but you can't do this with a multimeter.

https://www.jeepgladiatorforum.com/...ery-with-a-premium-h7-group-94-battery.76866/

Can both of these batteries effectively be charged together still hooked up ?
About 2+yrs ago I changed my Aux and I charged it overnight before installing.
Am I looking at a new battery already
Im with @Maximus Gladius ,I am starting to write the Eulogy for the Aux battery maybe move to a Genesis and run heavy cables up front and connect exactly how the Aux lawn and garden battery does.

 

[Maximus Gladius]

Lol, its y'all down in the south

It’s just easier to point

 

[Stan H]

It’s just easier to point

Not when 9/10 of all the guys on this site answer to the name Bubba

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