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Has Anyone Put a Battery Tender on their Auxiliary Battery?

jebiruph

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Yeah but the IBS monitors the battery state more than just during start-up from what I understand. But if the IBS is only really connected directly to the main start battery, with no other ground underneath that IBS but before the battery post, how does it accurately assess the Aux battery state?
It does not (cannot) accurately assess the aux battery state, that was the point of my post. And it can only read the voltage of the aux battery when the batteries are seperated, which is during the cold start test and an ESS event.
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chorky

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Thats what i though…but was pretty sure ai read on another thread that it did.
 

hjdca

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I hook up a trickle charger to my main battery, on the top most connections, so, the IBS is included. This charges both my main battery and aux battery.
 

ShadowsPapa

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I hook up a trickle charger to my main battery, on the top most connections, so, the IBS is included. This charges both my main battery and aux battery.
Perfect.
 

Freebooter

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Great info but a couple of questions: I have a 2020 and would turn off the ESS almost every time I started the engine. About 6 months ago, 28k miles, the ESS just stop coming on and I do not need to push any buttons. Truck starts up perfectly even after several days of temps around 15 F.

1. Does the truck "learn" I do not want the ESS working and disables it by itself? (that would be nice)
or
2. Is one battery (aux) low enough to not activate ESS but the starting battery is good? (change batteries)

Like the solar charger idea. We do some remote beach camping.
 

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sharpsicle

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Great info but a couple of questions: I have a 2020 and would turn off the ESS almost every time I started the engine. About 6 months ago, 28k miles, the ESS just stop coming on and I do not need to push any buttons. Truck starts up perfectly even after several days of temps around 15 F.

1. Does the truck "learn" I do not want the ESS working and disables it by itself? (that would be nice)
or
2. Is one battery (aux) low enough to not activate ESS but the starting battery is good? (change batteries)

Like the solar charger idea. We do some remote beach camping.
No to #1.

#2 could be a variety of issues, battery state being one. There are a ton more, though, and your center gauge display should give you more information on what's going on.
 

ShadowsPapa

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Great info but a couple of questions: I have a 2020 and would turn off the ESS almost every time I started the engine. About 6 months ago, 28k miles, the ESS just stop coming on and I do not need to push any buttons. Truck starts up perfectly even after several days of temps around 15 F.

1. Does the truck "learn" I do not want the ESS working and disables it by itself? (that would be nice)
or
2. Is one battery (aux) low enough to not activate ESS but the starting battery is good? (change batteries)

Like the solar charger idea. We do some remote beach camping.
1. NO WAY. It's set so that it must come on every start. That's the rules (unless otherwise bypassed by some electronic add-on device)
2. The batteries will start the truck fine, but be way to low for ESS to work. And if that's the case, you aren't doing the batteries any favors.

With a 2020 model I'd expect you are reaching the time where the batteries may be low on life.
These things start so easily people assume that since it starts fine the batteries are up fine. The batteries can be under 50% charge, mostly "dead" as far as voltage but still start the truck.

AGM batteries typically live around 3 years - some less, some more.
A lot depends on how often you drive it and how LONG or far you drive it. Infrequent drives or a lot of short drives are a problem.

You can look at the cluster display - right in front of your face, where the speedometer is - and move the steering wheel up/down and left/right buttons to see the voltage of the truck - do it while it's running and see the system voltage run running. Press the big start button without putting foot on the brake and it's like turning a key to ACC or run without starting it. Two presses without touching the brake pedal gets it into run mode and you can see a lot of things.
Check your voltage without it running either that way or with a volt meter on the battery terminals under the hood.
My bet - low batteries, batteries getting old, not fully charged, is where the problem is.

Cold temps mean batteries take longer to charge - so infrequent or short drives are worse in the cold weather.
 

Freebooter

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Thanks men.............time for new batteries!
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