Jumperless Aux Battery Bypass

[steelponycowboy]

@steelponycowboy

You want to disconnect the Aux battery negative cable found on the negative side of the Main battery in the engine compartment. That particular black cable is the slightly smaller diameter cable of the 2 cables you find there.

Thanks, that is what I thought. I hate these damn pop up ads on here, had trouble replying as the ads hid the navigation bar

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[Rhinebeck01]

Thanks, that is what I thought. I hate these damn pop up ads on here, had trouble replying as the ads hid the navigation bar

@steelponycowboy

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[Mtrctylarry]

@steelponycowboy

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[Speed331]

Finally got around to doing this to my '20 last weekend. I've had a intermitent 'service start/stop' warning popping up every few days and really didn't want to replace another aux battery after only 18 months.
Really is a simple and effective work around.
A week on and I've had no weird side effects and no more yellow @ staring at me from the dash. Shoot the start/stop hasn't (when I forget to push the off button) worked this consistantly in months. The main battery is always fully charged now. The aux must have been slowly leaching more and more ergs from it for a while now.
The start/stop never bugged me in and of itself - it was the inconsistancy of it's availability. When it works, it is one of the better systems I've experienced. It starts quick and without throttle lag.
My wife's Land Rover's system is horrible! It bogs down or stalls out on restart 70% of the time. Once it left her blocking the fast lane on the freeway after commute traffic came to a brief stop. Not only did it stall on restart, but took a good five minutes to get it to turn over again. She called me in a panic. I told her to get out, lock the car with the remote, unlock and get back in. Doing that reset something in the system that allowed it to starr agian. When in doubt - reboot.

 

[Ddrag1]

Question for the experts here. I just replaced my main battery and, at the same time, pulled fuse 42 and disconnected the negative cable to the aux battery. I am experiencing a couple of strange things. Specifically, the back up camera does not work, I am unable to set the temperature for climate control (it’s stuck on LO) and the Unconnect screen appears slightly different (this could be my imagination, but I don’t think so). Are these things that will go back to normal after several ignition cycles?

The other thing is that the stop/start does not work. It was not working before the bypass and I was just getting the message that it was not working because the aux battery was charging. After doing the bypass, I fully expected it to start working again. But, it still is not working and I am still getting the battery charging message. Thoughts?

Thanks in advance for any guidance.

 

[Ddrag1]

Question for the experts here. I just replaced my main battery and, at the same time, pulled fuse 42 and disconnected the negative cable to the aux battery. I am experiencing a couple of strange things. Specifically, the back up camera does not work, I am unable to set the temperature for climate control (it’s stuck on LO) and the Unconnect screen appears slightly different (this could be my imagination, but I don’t think so). Are these things that will go back to normal after several ignition cycles?

The other thing is that the stop/start does not work. It was not working before the bypass and I was just getting the message that it was not working because the aux battery was charging. After doing the bypass, I fully expected it to start working again. But, it still is not working and I am still getting the battery charging message. Thoughts?

Thanks in advance for any guidance.

All is good. After a couple of ignition cycles, the back up camera and climate control started working properly. I changed the Uconnect screen background when I bought it. I guess it just needed to be changed again after disconnecting the battery. Finally, after driving it for about 30 minutes the stop/start working. So, everything is as it should be..

 

[Rhinebeck01]

All is good. After a couple of ignition cycles, the back up camera and climate control started working properly. I changed the Uconnect screen background when I bought it. I guess it just needed to be changed again after disconnecting the battery. Finally, after driving it for about 30 minutes the stop/start working. So, everything is as it should be..

Just saw your original post. Typical what you had happen.

 

[Ddrag1]

Just saw your original post. Typical what you had happen.

Thanks, Rhinebeck01 for your reply and thanks for all of the effort you have put into this issue and all of the guidance you have shared with the rest of us..

 

[sweet88gt]

So I was in a rush and it is dark.
I tried by removing fuse 42 and capping off smaller cable. Went to start Jeep and click. Tried again nothing. Dash lights up so I have power of some kind.
Put it back together and it didn't start first try. Second try it did start.

Reason is Im on original small battery and dealer changed larger battery back in May. Now Im getting hard start yesterday and today. I have a 2020with 25000 miles 3.6 NA with auto. Tazer mini installed with ESS turned off.

Im guessing either I did something wrong or the large battery is dying or dead. Any help will be appreciated.

 

[ErAcEr]

Its said that the parallel of the 2 batteries if one is bad it will degrade the other. SO yes quite possibly your main is dead/bad again. Also some report that the smaller of the cables has been backwards so double check which one goes to the aux. Its also beneficial to upgrade the main to the bigger battery as well, another anecdote is the main fuse array can blow as well.

Best of luck

So I was in a rush and it is dark.
I tried by removing fuse 42 and capping off smaller cable. Went to start Jeep and click. Tried again nothing. Dash lights up so I have power of some kind.
Put it back together and it didn't start first try. Second try it did start.

Reason is Im on original small battery and dealer changed larger battery back in May. Now Im getting hard start yesterday and today. I have a 2020with 25000 miles 3.6 NA with auto. Tazer mini installed with ESS turned off.

Im guessing either I did something wrong or the large battery is dying or dead. Any help will be appreciated.

 

[sweet88gt]

Its said that the parallel of the 2 batteries if one is bad it will degrade the other. SO yes quite possibly your main is dead/bad again. Also some report that the smaller of the cables has been backwards so double check which one goes to the aux. Its also beneficial to upgrade the main to the bigger battery as well, another anecdote is the main fuse array can blow as well.

Best of luck

Well the Jeep wouldn't start today so Ill be back at it after work. Every 6 months I have to deal with battery issues it seems as of late.

 

[damageinc321]

I have a 2018 jlur 3.6 auto. I have a tazer with ess turned off. Battery died while at paint shop getting corrosion issue fixed last year, so I had both replaced. Now I just got back home after being gone for 11 days and Jeep was dead. I was able to jump it by putting charger on neg terminal on battery and positive on first terminal on fuse box I believe N1. Everything is good for now but I worry that aux battery will drain big battery. How do you eliminate aux battery to not drain big battery?

 

[sweet88gt]

Just so Im clear
I have both neg terminals off of the large battery. I check power from the positive terminal to each black wire and the smaller of them has 11 volts. That should confirm I have the correct wire for Aux battery.
Dealership wants me to bring it in but they can't look at it for a few days.
Im pretty sure Ill get the same run around as before and need to buy a battery anyway. I think I'm going to skip that mess buy a battery and just be on my way.

 

[Heimkehr]

How do you eliminate aux battery to not drain big battery?

That is the very raison d'être of this thread. Start on p. 1. ?

 

[Ddrag1]

I have some questions about start/stop and the aux bypass. I replaced my battery a couple weeks ago with a new Interstate battery (the larger one) and did the bypass. After driving a half hour or so, start/stop started working as typical. Within a day or two, it stopped working and I started getting the battery charging message. Even though it was a brand new battery, I stuck it on my trickle charger overnight to top it off. Start/stop started working again as typical. A week or so later it stopped working again and the battery charging message came back. After charging it again overnight, start/stop is not working and I continue to get the charging message. According to the dash, the battery is reading 13.8 to 13.9 while driving around. At idle it reads 13.8. I‘m thinking that the new battery is defective and that the next step would be to load test it. Thoughts? Thanks, in advance, for any guidance.

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