Auxiliary Battery? Empty!

[SD-Rubi]

A total of four main batteries in 12,000 miles?

Unfortunately true. Paid for two, two under AAA warranty.

Sponsored

 

[Zandcwhite]

Thanx... Yes, the main 12v battery. AAA tested out the battery and charging system. The battery was definitely dead (9.8v). I need a more deep dive on the charging system. Agree on the possibility of parasitic draws. I've added a light bar, an RV tow package, and an auxiliary braking system. Front/rear dash cams are both switched.

Interesting the many responses on the lack of the auxiliary battery. I am the original owner, bought new from a dealer in Tustin CA. I am absolutely certain this vehicle came from the factory with only one battery.

On a 2019 2.0t I'm almost certain it cage with etorque so there are in fact 2 batteries. One is the massive 48v mounted underneath with its own skid plate as pictured above. You don't have an aux 12v battery...or an alternator. The belt start generator charges the 48v battery and the 12v battery is chaged by a DC to DC inverter. Literally takes 5 seconds to look underneath. If there is a skid plate on the drivers side behind the transfer case you have etorque.

 

[acomputernerd]

If you have leds and are Flat towing it is known to drain the battery. There is a bypass switch you can add that will stop this. I would look into that as well.

 

[Bandit59]

Thanx... Yes, the main 12v battery. AAA tested out the battery and charging system. The battery was definitely dead (9.8v). I need a more deep dive on the charging system. Agree on the possibility of parasitic draws. I've added a light bar, an RV tow package, and an auxiliary braking system. Front/rear dash cams are both switched.

Interesting the many responses on the lack of the auxiliary battery. I am the original owner, bought new from a dealer in Tustin CA. I am absolutely certain this vehicle came from the factory with only one battery.

Well my bet it does not have an alternator and it’s a etorque. I have a etorque v6 no issues

 

[ScotM]

Not all jeeps have 2 batteries.. there are some that only have the 1 main battery

Wouldn’t that violate the emissions standards that Jeep has certified to?

 

[Terrymo]

I’m a doubter about the lack of a 48 volt battery under the OPs Jeep until I see photographic forensic evidence

 

[DogsRule]

Wouldn’t that violate the emissions standards that Jeep has certified to?

I was wondering about that too. Especially when disconnecting the S/S systems.

And hasn't anyone done a parasitic draw test yet? Can't do it in the 1 minute in a dealer bay IIRC. Gotta let everything drain first. Service pit boss isn't gonna stand for that.

 

[SBLACK502]

Wouldn’t that violate the emissions standards that Jeep has certified to?

No clue.. I personally know 5 people with 1.. from what another person said.. it appears to have happened during the supply shortage during Covid.. but I know for certain some jeeps only have 1

 

[oldnavygunner]

2019 Rubicon JL, 12,000 miles, 2 L Turbo 4

I was getting error messages pertaining to auxiliary switches unavailable, and have replaced the chassis battery 3 times.

Dealer told me it was the auxiliary battery.

I took it to my local repair guy who dropped the fender liner and pulled the auxiliary battery case. It was empty! No cables, nothing. Case looked like a battery was never there.

Any advice here? Everything is saw online indicated that auxiliary battery was under the fuse block, accessible thru the fender liner.

Bizarre. Help?

I have a 2018 JL with 2.0 and etorque that only has the one battery. Aux battery box is empty with no wires. Have had my local mechanic that I’ve used for years go over it while on lift. No extra battery.

 

[Terrymo]

I have a 2018 JL with 2.0 and etorque that only has the one battery. Aux battery box is empty with no wires. Have had my local mechanic that I’ve used for years go over it while on lift. No extra battery.

I’m including either the 12 volt secondary/auxillary battery in the passenger fender area or the 48 volt etorque battery under the Jeep as being the two general options I am aware of. Not saying anyone is wrong when they say they have neither, just that I had never heard of it. I learned something new. Do 392s have only have the one main battery in the engine compartment?

 

[ScotM]

Wouldn’t that violate the emissions standards that Jeep has certified to?

Thinking about it, without the aux, the start stop will still work…

 

[AcesandEights]

Wouldn’t that violate the emissions standards that Jeep has certified to?

Not anymore, haha.

 

[JLEdCeD]

First things first…
Enter here:
https://fcagroup.my.site.com/RAM/s/equipment-listing
Run your vin number to know your jeep equipment and other things…

 

[SD-Rubi]

First things first…
Enter here:
https://fcagroup.my.site.com/RAM/s/equipment-listing
Run your vin number to know your jeep equipment and other things…

That is a great site! Thanks!
2.0L I4 DOHC DI TURBO ETORQUE ENGINE

 

[THAW]

Do 392s have only have the one main battery in the engine compartment?

Yes. And no ESS at all.

Sponsored