Your battery voltage - truck off and at rest

[Erievon]

Agreed. they are I think for 3 years? I thought you were venturing to say that putting n an Optima would somehow void any warranty work of the charging system. But yeah I agree, if its a failure should be warrantied.

Yes three years. The battery resides between the bumpers ?

Sponsored

 

[ShadowsPapa]

About the AGM I was asking because I couldn't understand the context of the sentence. It was a few pages back probably, but anyway, man thats frustrating. I understand your wanting to have it working properly because that's what it's there for. I just purchased my Glad yesterday. When I drove off the lot for a test drive it said 'not ready' also. I think I tested voltage this morning on the main battery at 12.6 if memory is right. Leaving ESS on for a 4 hour joy ride today it finally cut the engine at a stopsign somewhere along the way - that was 2 hours into the drive. No doubt I will be experiencing similar issues as you.

So did you test the voltage with a meter when you got home or just the vehicle's systems? I would be curious to see how much voltage drops over the night - and will probably go check mine right now and see as well. Not that it's any bit of a good excuse but the standby systems can't be great for the battery over a period of time.

Edit:
For reference if it helps mine is sitting at 12.79 right now.

Wow, really - 12.79. Interesting.
I check with my Fluke as I have noticed the cluster voltage display actually has gone up and down .2 to .3 volts in 3 or 4 seconds like it wasn't making up it's mind. I see with a Fluke it might change from like 12.19 to 12.20 and that makes sense - it's got to round at some point and a .001 deviation is to be expected when holding probes in place.

 

[chorky]

Wow, really - 12.79. Interesting.
I check with my Fluke as I have noticed the cluster voltage display actually has gone up and down .2 to .3 volts in 3 or 4 seconds like it wasn't making up it's mind. I see with a Fluke it might change from like 12.19 to 12.20 and that makes sense - it's got to round at some point and a .001 deviation is to be expected when holding probes in place.

Yeah I was surprised too. Was expecting more like 12.5 for some reason. That was with my meter though, I did not check to see what the vehicle's computer said. I'll check again tomorrow mid day'ish and see what the meter says.

I dont know much about these new fancy electrical systems though, so if there were ever a problem, I probably couldn't fix them. Old school stuff is simple, this new computerized stuff is not something I've kept up on. On my TJ it usually sits about 12.65 although I haven't tested it very routinely. Guess I've never had a problem before, then again these vehicles are more sensitive to voltage changes it seems.

Have you tried isolating the Aux battery to see what the voltages of the two of them are separately? Just in case there is some sort of weird feedback loop going on.

 

[ShadowsPapa]

Yeah I was surprised too. Was expecting more like 12.5 for some reason. That was with my meter though, I did not check to see what the vehicle's computer said. I'll check again tomorrow mid day'ish and see what the meter says.

I dont know much about these new fancy electrical systems though, so if there were ever a problem, I probably couldn't fix them. Old school stuff is simple, this new computerized stuff is not something I've kept up on. On my TJ it usually sits about 12.65 although I haven't tested it very routinely. Guess I've never had a problem before, then again these vehicles are more sensitive to voltage changes it seems.

Have you tried isolating the Aux battery to see what the voltages of the two of them are separately? Just in case there is some sort of weird feedback loop going on.

I have not tried to isolate the batteries to get independent voltage checks.
Charging systems up through the 90s are more my specialty so I'm still learning.
I've done literally hundreds of 'em but all before 2000.
As we have two Jeeps and likely always will - this is not only a quest to get mine resolved/fixed/figured out, I want to know as much as possible for the future and moving forward.
Anyway, I'll check voltage again tonight, then in the AM and keep monitoring it and see if I see any pattern as well.
I may try to get independent voltage measurements as well as resetting the IBS.


(my alternator and starter cores)

 

[Rocksalt]

Truck off 12 hours
battery voltage 12.27 on my multimeter
ESS hood plunger disabled
not been in shop

 

[chorky]

Just checked. Been sitting about 21 hours now.

12.67 v

so it lost 0.12 volts sitting. Honestly I am not surprised. With as many electrical systems that are on 'standby' in these things anymore.

I will test again tonight if I remember, after doing a few things without turning on the engine.

Also for reference when I tested yesterday at 12.79 that was probably only an hour after turning off the engine. So it probably had some surface charge still remaining. Either way, one could reason that a JT sitting any longer than 3 days without driving enough to bring batteries to full charge would result in a destroyed battery. I wonder how many times it takes an AGM to fall below 80% to permanently kill it.

I also cannot say for sure if this short little test is due to a potential issue with my own Aux battery as they are both connected. So a bad aux could be causing that 0.12v drop. But, it's another reference point.

 

[ShadowsPapa]

Just checked. Been sitting about 21 hours now.

12.67 v

so it lost 0.12 volts sitting. Honestly I am not surprised. With as many electrical systems that are on 'standby' in these things anymore.

I will test again tonight if I remember, after doing a few things without turning on the engine.

Also for reference when I tested yesterday at 12.79 that was probably only an hour after turning off the engine. So it probably had some surface charge still remaining. Either way, one could reason that a JT sitting any longer than 3 days without driving enough to bring batteries to full charge would result in a destroyed battery. I wonder how many times it takes an AGM to fall below 80% to permanently kill it.

I also cannot say for sure if this short little test is due to a potential issue with my own Aux battery as they are both connected. So a bad aux could be causing that 0.12v drop. But, it's another reference point.

I can understand the slow drop - it makes sense with these "monitoring" things going on like looking for a key fob and more, but........ it's one thing when they start out at 12.7 or so and drop a couple tenths in a few hours but to start at 12.3 and drop, that's getting into danger territory and they seem to never fully charge, or mine don't.
Mine is now sitting at 12.79 after charging with my other battery minder that seems to charge at higher voltages.

To start at 12.7 or even 12.6 and drop is one thing - starting at 12.3 or 12.2 like mine and then drop, that's my beef.
I have some more detail on the operation of the IBS I'll try to post up later. Supposedly when the IBS detects voltages down far enough it tells things to either shut down, or not wake up when the engine is not running.

 

[chorky]

That's interesting. And I certainly would be concerned if it was only 12.3 after driving for a day as well. That's not right. At least the minder brought it up to 12.7. Now it will be interesting to see if it holds like mine and others do or if it drops super fast - possibly indicating a drain or a bad aux battery or something....

I wonder if your charging system has an issue and is not charging at the correct voltage? That would be a strange issue to have though but not impossible I suppose.

Do you know the spec for what the voltage of these systems should be? I don't. Just curious.

 

[chorky]

Just tested again before sundown. Holding at 12.68. So that reading yesterday must have been surface charge.

Now, it was unlocked all day today since I was home. So the alarm was not 'armed'. However, I did pop in it a few times to loo at some settings and things and ran the head unit without starting.

 

[dcmdon]

Sorry if I'm late to the party. But I just saw this and you've answered enough of my questions that I went down and put my Fluke meter on it.

I got 12.82 volts.

I just got back from a 120 mile drive 2 hours ago.

I measured the top of the battery at 80 deg and multiple points midway up on the vehicle's right side of the battery at about 75 deg.

 

[RJA]

I have a 2020 Overland and did have a problem with my ESS system.

1. Symptom - Info screen states the On/Off system is not ready even after meeting all 12 enabling requirements.
2. Battery OCV after resting for over 24 hrs read 12.3 VDC.
3. Took in to dealership to check. They stated Aux battery bad. They replaced both.
4. OCV with new batteries after resting for 24 hrs reads 12.59 ~ 12.6. Thought this was normal for fully charged battery. Thought I still had a lead-acid battery.
5. Since what I am reading in this thread means I really have an AGM battery, then maybe I still have issues.
6. Alternator charge voltage of 12.9 (fully charged) to 14.2 (after sitting over a weekend).

 

[ShadowsPapa]

Even with the batteries charged for 12 hours and sitting at 12.7 volts, mine still goes 14.4-14.6 or so when running.
I watch the voltage when ESS works and watch it quickly drop to about 11.9, then when it restarts it slowly goes up through the 13s into the mid 14s again. I figured with a charged battery it shouldn't be sitting so high because the 3rd phase of charging this is a reduced voltage (in the 13s, more later - dealing with quilting machine issues for my wife)

 

[Gatorized]

What ar e the 12 enabling characteristics?
mine is at 12.4V after sitting for a week. I have had issues with the auto stop not activating on the first ride after it has been sitting, but only after reading this thread did I make the connection that it might be battery related. Always thought I might have a door ajar or engine not warmed up… but I don’t believe I have ever seen a message on the display.

 

[ShadowsPapa]

Use the up/down arrows on the left of the steering wheel and scroll to page 7 in the cluster display.

I bet Canadians and Alaskans see this one a lot - it was sub-0 that day as I recall. I didn't want to work, either...........

 

[kahuna357]

I have a 2020 Overland and did have a problem with my ESS system.

1. Symptom - Info screen states the On/Off system is not ready even after meeting all 12 enabling requirements.

What are the 12 enabling requirements? All I ever see is engine temp too low, cabin heating or cabin cooling. After that it's Not Ready or Ready and that's it. Is there anywhere I can look up these enabling requirements?

Sponsored