My '22 Overland completely dead this morning. What to check / do?

[the hiking viking]

Came home from camping yesterday afternoon. Parked in the drive and got everything out of the travel trailer (TT). Relaxed for a few hours in the house. My TT was connected to my Jeep via the 7-pin plug for about four hours. Tried to start it and just got one click and nothing else, just dashboard lights coming on, plus radio. Great, thinking the TT sucked the Jeep's battery dead.

I unplug the TT 7-pin plug from the Jeep and... go back inside. It's late, I'm tired.

This morning, get my fully charged Jump powerpack and hook it up to the Jeep. Nothing. Jeep is completely dead, no dash lights, no clicks, no signs of life whatsoever. Jump powerpack did nothing so get the wife's Equinox and the jumper cables. Hook it all up and... Nothing still. Ugh.

Help. Do I have a Dealer visit in my future? Did I damage something leaving my TT plugged in for four hours? I've done that before with my F-150 and same TT with no issues. I know how to use jumper cables and jumper powerpacks so that's not the issue. I'm at a loss as to why my Jeep is completely dead and battery won't take a jump, battery is less than two years old and I inspected it, no signs of any problems there. Something I can do here besides call for a tow and get it to the dealer?

Thanks.

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[ShadowsPapa]

The 7 pin connector is live all the time - all the time, never shuts off.
So it's possible (didn't say likely, just possible) that the TT drained things.
If both batteries are flat dead, a booster pack or jump start won't work.
You'll need to charge things for a period of time.
If you have a battery charger, connect it and leave it for a few hours.
The reason a jump start won't work is timing - if you had left the jumper cables connected for several minutes, the donor vehicle (the live one) running at a high idle for several minutes, it likely would start.
If both batteries are totally dead, they will pull power from the donor vehicle but there won't be enough "voltage" for the PCM to decide things are ok to start.

My thinking - connect a real battery charger - something over 10 amps and let it sit charging. Then try it again later.

Fast jump starting doesn't work on totally dead, 0 to 20% state of charge batteries - you'll have to get them up at least a little bit first.
It's why people get left stranded - they are impatient and claim a jump start can't work - it can, if given TIME. Leave things connected long enough and the battery voltage on the dead vehicle should rise enough for a jump start to work.
But connecting, then waiting impatiently 5 or 10 minutes then yelling "these Jeeps suck" is a laugh because they aren't thinking it through.

If you did let things sit charging for at least 10 minutes before trying to start it - then there's another issue.
Still, if you have a battery charger - use it. Even better, try to charge each battery - aux and main, separately. Charge main, then aux, or aux then main. But charging them connected together usually works fine, too.

 

[the hiking viking]

Ahh, yes... seems I forgot that tidbit about a dead battery won't jump. Thank you sir.
Neighbor bringing over his battery charger shortly, 10amp version. Will hook it up and see what happens after a bit.

Interestingly, I know the 7 pin is live all the time, we used Harvest Host (boondocking camping just about anywhere) and we pulled this TT with our 2018 F-150. Never ever had an issue overnight with a dead battery in the morning. Hmmmmmm.

The 7 pin connector is live all the time - all the time, never shuts off.
So it's possible (didn't say likely, just possible) that the TT drained things.
If both batteries are flat dead, a booster pack or jump start won't work.
You'll need to charge things for a period of time.
If you have a battery charger, connect it and leave it for a few hours.
The reason a jump start won't work is timing - if you had left the jumper cables connected for several minutes, the donor vehicle (the live one) running at a high idle for several minutes, it likely would start.
If both batteries are totally dead, they will pull power from the donor vehicle but there won't be enough "voltage" for the PCM to decide things are ok to start.

My thinking - connect a real battery charger - something over 10 amps and let it sit charging. Then try it again later.

Fast jump starting doesn't work on totally dead, 0 to 20% state of charge batteries - you'll have to get them up at least a little bit first.
It's why people get left stranded - they are impatient and claim a jump start can't work - it can, if given TIME. Leave things connected long enough and the battery voltage on the dead vehicle should rise enough for a jump start to work.
But connecting, then waiting impatiently 5 or 10 minutes then yelling "these Jeeps suck" is a laugh because they aren't thinking it through.

If you did let things sit charging for at least 10 minutes before trying to start it - then there's another issue.
Still, if you have a battery charger - use it. Even better, try to charge each battery - aux and main, separately. Charge main, then aux, or aux then main. But charging them connected together usually works fine, too.

 

[AlxCZ]

I had a similar problem turns out a ground came loose, affecting starter, basically would not start up but some electronics were still working, like lights, radio. What symbols came up on your dash?

 

[the hiking viking]

Charging the completely dead battery did the trick. About 40 minutes on the 10 amp charger gave it a good charge and it started on the first push of the button. I let it run for about 30 minutes to charge the battery some more than I shut it off and waited a few hours. Started it up no problem a few hours later.

I do have the 'check engine' light on now, have to read the code and see what it's telling me. And the Auto Start Stop idiot light is lit as well, will look that up when I have the time.

Thanks!

I had a similar problem turns out a ground came loose, affecting starter, basically would not start up but some electronics were still working, like lights, radio. What symbols came up on your dash?

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