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Narrowing down parasitic charge on Genesis Gen 3 dual battery setup

JeepOfTheseus

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The title isn't meant to imply the Genesis kit is to blame, but to clarify up front what my configuration is.

I've been having an issue where if the Jeep sits for ~1 week or more, it won't crank and I have to use the boost mode. Both batteries were obviously installed around the same time: 3 years ago. This time, I left for 10 days and it was down to 9.5v. The boost mode always saves me.

To quote Genesis: "Devices connected to the bus bars run from the Aux battery and will not drain your cranking battery." Provided this is true, it heavily narrows down what accessories I have that would be drawing power from the cranking battery:

* Aux Switches - 2 switches are ignition only, 2 are battery power. Of those, I generally only leave 1 on: my Midland MXT275VP4 15 Watt GMRS, but I leave the "actual" radio off...it's only for utilizing the pass-through USB-C charger in the event that I'd want to, which is rare, if ever.

* Digital Rear View Mirror/Dash Cam - I need to double check, but I believe I have it set to recording while parked. However, I'm running their hardwire kit anyways which has battery protection at 11.3v, 11.8v or 12.1v.

* Tazer Mini - I know there is risk of this keeping the dash on if you don't follow the save procedure, but I do. I can also assert that the dash never stays on.

* Pedal Commander - I'd hope/assume this is only drawing when the vehicle is on.

* Veepeak BT OBD Reader - Similarly, I assume this is only when the vehicle is on, because I don't believe I can even connect to it if it's not.

* PAC AP4-CH41 (for adding amplifiers) - I've also heard that in the first revision of this there was risk of parasitic draw, however that was resolved in the second version which I have.

Short of waiting for 6+ various long out-of-town trips, is there any way to narrow this down? Do any of these even seem like something that could draw that much power?
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Mr._Bill

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Which head unit do you have? The 8.4 Uconnect is a steady parasitic draw. The truck computers never actually turn off.

Three years is a long time for the batteries, especially where they have been allowed to regularly discharge. Keeping the batteries charged prolongs their life.

If the truck is going to sit for more than a few days, it should have a battery maintainer connected.

Separate and fully charge each battery with a good AGM charger. Pull the IBS and reset it while the batteries are charging. They may recover some and not need immediate replacement. Get a battery maintainer and keep it connected when the truck is parked.
 
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JeepOfTheseus

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Which head unit do you have? The 8.4 Uconnect is a steady parasitic draw. The truck computers never actually turn off.

Three years is a long time for the batteries, especially where they have been allowed to regularly discharge. Keeping the batteries charged prolongs their life.

If the truck is going to sit for more than a few days, it should have a battery maintainer connected.

Separate and fully charge each battery with a good AGM charger. Pull the IBS and reset it while the batteries are charging. They may recover some and not need immediate replacement. Get a battery maintainer and keep it connected when the truck is parked.
Yea, it’s the 8.4 - didn’t realize it had that issue.

How does IBS factor in here? I thought that was the terminal they have you remove…or maybe I’m mistaken.
 

Mr._Bill

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Yea, it’s the 8.4 - didn’t realize it had that issue.

How does IBS factor in here? I thought that was the terminal they have you remove…or maybe I’m mistaken.
The IBS connects to the negative terminal on the Main Battery. The negative cables connect to the IBS. It monitors flow in and out of the battery. The computer uses data from the IBS to make decisions about charging and alternator output.
 
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JeepOfTheseus

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The IBS connects to the negative terminal on the Main Battery. The negative cables connect to the IBS. It monitors flow in and out of the battery. The computer uses data from the IBS to make decisions about charging and alternator output.
It was the auto-start stop battery ground cable I was thinking of.

Now that I think about it, I don't know why the "Auto" mode of the Genesis isn't doing it's job here:
  • Auto - Connects the batteries automatically based on their voltage level
  • On - Manually connects the batteries together just like jumper cables to help start the engine
  • Off - Manually separates the batteries
Seems like it was meant to solve exactly my issue.
 

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Mr._Bill

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It was the auto-start stop battery ground cable I was thinking of.

Now that I think about it, I don't know why the "Auto" mode of the Genesis isn't doing it's job here:
  • Auto - Connects the batteries automatically based on their voltage level
  • On - Manually connects the batteries together just like jumper cables to help start the engine
  • Off - Manually separates the batteries
Seems like it was meant to solve exactly my issue.
The Genesis is doing what it is designed to. It keeps the batteries isolated when the engine is off so they both don't discharge. The Boost feature allows you to recover from a discharged Main Battery and get the truck started. It doesn't have the ability to prevent discharge of either battery.
 
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JeepOfTheseus

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The Genesis is doing what it is designed to. It keeps the batteries isolated when the engine is off so they both don't discharge. The Boost feature allows you to recover from a discharged Main Battery and get the truck started. It doesn't have the ability to prevent discharge of either battery.
Makes sense...in hindsight, I guess I don't know how it could be smart enough to detect cranking without some other signal.

May just have to invest in their remote button to switch modes and/or a maintainer as you said.
 

Mr._Bill

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Makes sense...in hindsight, I guess I don't know how it could be smart enough to detect cranking without some other signal.

May just have to invest in their remote button to switch modes and/or a maintainer as you said.
The remote button is convenient. It allows you to activate the Boost mode without opening the hood.

Since it's not driven regularly, I would suggest the battery maintainer. It will help the battery to last longer. The parasitic draw will be a constant issue.
 

Jaxmax

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The Genesis Gen 3 has a ignition sensing wire, that goes from it to a fuse tap on an ignition only circuit, in fuse box. The system will disconnect the batteries as the house battery gets lower, mine does it all the time. My 21 Mojave sits at times two to three weeks as I work long hours and have a company truck. I am not 100% sure if hooking up batteries backwards would would affect the disconnect feature. I love mine and when at the beach overnight my fridge will take it down low enough to disconnect.....Jack
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