Problem this morning!!

[Renegade]

I understand, and thats the problem. I drive my truck all the time(only vehicle). I drive it the day before putting more than 20 miles on it and it is perfect. The next morning...Kaput! No, headlights, overheads, ignition left on overnight and weird things happening when I try to start it the next morning. Couldn't even get it out park when the dash was telling me it wasn't in Park. I pulled the little strap to allow me to put in neutral so I could at least get it to roll freely and had Hagerty tow it for me.
Dave

It's likely that the auxiliary battery failed, then drained your primary battery overnight. I really don't understand the hows/whys of this system. If you can figure it out, it might help to disconnect a failed auxiliary battery when jump starting, in order to prevent it from pulling amperage from the main battery during starting.

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[Jtschnel]

While I really like my Gladiator, in the two years I've owned it, I'm on my 3rd set of batteries. Everything else has been great. I had the same thing happen to me last time. Told me I was not in Park(it was), could not turn to OFF, one headlight on, windshield wipers activated, and dash lit up like a Christmas tree. Had it flat bedded to the dealer and they used a jump box to start. Everything normal, another set of bad batteries! All have been replaced under warranty. Months ago I read that Jeep had received a bunch of bad batteries and perhaps that's the problem. I hope so because it's expensive to have these replaced if you have to pay for them. I'm hoping there is not a parasitic drain somewhere in the electronics. I now carry my own jump box just in case.
Ninety-nine percent sure it's bad batteries.
Dave

Out of curiosity, what "jump box" do any of you use? I'm looking for something to carry, as well, but want to make sure it's one with lots of capacity ... for other potential vehicle use.

 

[REDBEAST]

Those diagrams above are gold ... I recall the JL thread and it seemed that the two batteries run in parallel. This increase in Amp Hr exceeds what most quick starters can handle. I believe the owners manual states to allow the jump vehicle to charge the dead batteries for a said period of time. "IF" I understand ... jumpering N1 - N2 ... and disconnecting the aux battery ground isolates the aux battery. Thus requiring the jump pack to only have to "amp up" the starter battery. Every time this comes up the Genesis Dual Battery system looks better and better ....

I installed the Genesis dual battery system on my 2020 JTR right after I bought it and have had zero electrical issues since. Highly recommend.

 

[dcmdon]

I installed the Genesis dual battery system on my 2020 JTR right after I bought it and have had zero electrical issues since. Highly recommend.

It seems ridiculous that that needs to be done to prevent this problem. But if it works, that is great.

I am not an electrical engineer and I don't fully understand how the batteries interact. But I do remember enough from engineering school to realize that there are multiple states.

My best guess is
1) key off engine off
2) key on, engine off.
3) key on, engine running.

What connections are in place between the batteries in each state?
Does it even change depending on the state.

It would seem that with the proper setup of diodes (essentially electrical check valves) and a relay that can either join or separate the 2 batteries, you could design a system that accomplishes the engineering goal (prevent voltage sag on the main bus when the starter engages) pretty simply.

Also, and I'm speculating, so please correct me if I'm wrong, the real benefit of the Genesis system isn't the 2 large batteries. Its the protections and isolation designed into the setup. Like I described above. I can see a relay in the Genesis system.

 

[Wyojeep]

It seems ridiculous that that needs to be done to prevent this problem. But if it works, that is great.

I am not an electrical engineer and I don't fully understand how the batteries interact. But I do remember enough from engineering school to realize that there are multiple states.

My best guess is
1) key off engine off
2) key on, engine off.
3) key on, engine running.

What connections are in place between the batteries in each state?
Does it even change depending on the state.

It would seem that with the proper setup of diodes (essentially electrical check valves) and a relay that can either join or separate the 2 batteries, you could design a system that accomplishes the engineering goal (prevent voltage sag on the main bus when the starter engages) pretty simply.

Also, and I'm speculating, so please correct me if I'm wrong, the real benefit of the Genesis system isn't the 2 large batteries. Its the protections and isolation designed into the setup. Like I described above. I can see a relay in the Genesis system.

It seems ridiculous that that needs to be done to prevent this problem. But if it works, that is great.

I am not an electrical engineer and I don't fully understand how the batteries interact. But I do remember enough from engineering school to realize that there are multiple states.

My best guess is
1) key off engine off
2) key on, engine off.
3) key on, engine running.

What connections are in place between the batteries in each state?
Does it even change depending on the state.

It would seem that with the proper setup of diodes (essentially electrical check valves) and a relay that can either join or separate the 2 batteries, you could design a system that accomplishes the engineering goal (prevent voltage sag on the main bus when the starter engages) pretty simply.

Also, and I'm speculating, so please correct me if I'm wrong, the real benefit of the Genesis system isn't the 2 large batteries. Its the protections and isolation designed into the setup. Like I described above. I can see a relay in the Genesis system.

Here is an excellent visual posted by Jerry
https://www.jeepgladiatorforum.com/forum/threads/ess-dual-battery-system-operation.44028/

 

[dcmdon]

Here is an excellent visual posted by Jerry
https://www.jeepgladiatorforum.com/forum/threads/ess-dual-battery-system-operation.44028/

Ha. I'm a bit ADHD and my head is spinning looking at that. But thanks. I'll work my way through it.
;-)

 

[DankjeeP]

There was an instructional thread on the JL forum of how to put a jumper wire on two of the PDC terminals when using a booster box. This allows both batteries to receive a charge. I'll find what I have and post it from my phone shortly.

Nice informative post. I appreciate this for reals!

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