Did this today with my son on his 2018 Jeep Wrangler. Very good video which made it dead easy to do. One word of warning, with both batteries disconnected and removed the auxiliary positive terminal touched the frame and sparked which means there must be a capacitor somewhere possibly for memory retention of settings. All worked fine, no settings lost. Seems much easier than removing the wheel and working through the fender as some videos suggest with the possibility of snapping fender clips. Thanks for the video
Thank you for a very informative video. You have tremendous patience I learned some new tips from you today and I loved the use of tie backs for the wiring harnesses. The engineers that came up with this design position for the auxiliary battery should be reprimanded. I can only imagine the labor cost to replace this auxiliary battery once it is out of warranty. Thank God! someone raised the BS flag, and gave the alarm. Some jeep lovers found an easier path to replace this aux battery (via the fender well). All batteries die eventually, in approx 3 to 4 years. So the owner would have to face this labor cost often during owning a jeep that they love over a 10 to 15 year period. Goodness I hope that an (after market engineering/company) or someone fabricates an inner fender access door to allow the access to the aux battery for us Jeep Lovers. Carry On Sir.
@@JeepingMo Are you sure about that? I read on the Wrangler forum it is to run the accessories will in stop mode at a light. It doesn't have the cranking amps of the main battery.
For the last 55 years I have been at a shop my dad and I started we used to build big tanks and repair a lot of equipment, but now a days we fabricate a lot of the steel parts used in the woodworking industry, like brackets and counter tops large support bases for desks and table assembles, at 69yrs old i still work just not as hard as i used to , but I still drive jeeps i don't plan on growing up i still want to have fun
Good video. If you have to do it again it is easier to pull the fender off and do it from the bottom. 4 or 5 screws for the fender and a push clip. 1 connector then 3 bolts on the battery case. No need to remove the fuse box and not bend a pin Great video though
Great video. Working on a 2018 Wrangler and it has start/stop but there is NO auxiliary battery! 2.0 L engine. When were the batteries introduced? I sort of don't care and somewhat happy but I am suspicious that something may be amiss and although it has taken about 3 years, I feel the main (only) battery didn't have that much service.
Thanks for the comment, yes you can. I don’t want to hang the battery from the terminals. Also make sure you have extra clips. It comes down to preference, I have had dealers tell me both ways. Hope we have you as a subscriber.
@@JeepingMo subscribed. You can lower it without hanging it by the wires but yes, my extra 25 count Amazon clip supply is getting low. I prefer the fender route because one wrong move with the fuse panel and having a fuse fail on you or something else electrically on the trail is worse news than replacing a 28 cent fender clip.
Great and Amazing video. I never knew the JL had a second battery, so learn something everyday. I plan on taking off my interior trim around my steering wheel and have to take out my airbags both driver and passenger side. Should I disconnect the secondary battery as well to prevent the airbags from going off?
Thanks for the question, truthfully I don’t know. If you look at my other video or stop start issues. I also show you where you can change the battery coming up that’s much easier
I’m not sure which post you use, but you can actually jumpstart your jeep from the large battery by putting a jumper on the fuse box. But you’ll have to look up which post. Thanks for your comment viewing and subscribing. Let me know how it goes thank you
Thanks for the question, I got mostly stop start error message. Then it pulled out power noticeably. The dealer was chasing parts, it took 2 years until I replaced it. Thanks for the question and subscribing. But I was also having cam phaser problems at the same time .
i made mistake on removing the big battery positve toches the ground after i returned the batt my system go abnormal and wont start i think i short circuited the aux batt
Thanks for the question, I have drove both the 2L and 3.6L. I prefer the 3.6, I would suggest driving both if your looking. I am not sure how it would do after lifting it. Thanks for viewing and subscribing
@@PatrickHolmesHollywood glad you found the problem, thanks for the channel support. Hope your a subscriber. Can I ask where your from. Look me up on Facebook or Instagram.
In the last two days I have been getting this funny message after starting my 2019 JL that the auxiliary switch bank is not available because the battery is charging and the vehicle 🚗 start stop function does not seem like it’s working last night driving home I noticed the engine didn’t shut off at the lights. Could this be the little battery? Excellent instructional video! PS Did it correct the problem.
I had many issues on my Jeep, and the battery was just one of them. I also had cam fazers going bad, that was making the charging system not work properly. It was a mess that took me a year to work through. Good luck on your Jeep.
@@Aceinfinity-le8zc I don’t remember what it said it was too long ago but I tested the charging system and both batteries 🔋 were testing bad and I had both replaced by the local Jeep dealership
If the state of charge is below seventy percent (I assume this is both batteries together) than the stop/start system will not work, this is how it is designed. There is a internal battery sensor connected to the positive terminal of the main battery, the computer does a test on state of charge every time you start the vehicle. If it is below seventy percent you will get a alert on the dash that the battery is still charging and stop/start is not available. This will give you a idea of how much life is left in your batteries. If under warranty the dealership will not replace batteries until state of charge is below fifty one percent. This is where I am at now. Two years and 22000 miles. My guess is my batteries will last past the three year 36000 mile warranty.
I also have a video showing how to go up through the fender. Please check it out, we discovered this after we change it the other way it’s much easier. Here’s the link. Replace Aux Battery, Update. th-cam.com/video/cll_poET5ho/w-d-xo.html
Ordered a new JL in July its supposed to be here by the 10th of December five months later. I now understand why it took so long it took them 3 months to install this stupid second battery. What an asinine design.
@@JeepingMo just replaced it This morning.. jeep wants to hold It there..or schedule way off in the future… but the 2021 JT has aux battery placed up higher.. didn’t have to dig down into the wheel well..👍
Why not just eliminate the auxiliary battery by connecting the aux positive cable to the main battery positive cable then completly remove the aux ground cable because you wont be needing that any more then you can throw that auxiliary motorcycle battery away. I would only do this if you dont use stop start system, but the stop start system will still function if you want it to.
Thanks for the comment, and watching the video. I would need to find out if it would be that easy. That’s a complicated system to short out. That is a little out of my depth. Electronics is not my thing.
@@JeepingMo Mine either. But i learned the aux battery only runs the accessories when the jeep is at a light and the engine is shut off. It does not start the jeep. Its not needed if stop start isnt on. I dont use stop start. When you change your system to a full fledged dual battery system you are doing the same thing. Youre connecting the positive aux cable to main battery cable and removing the aux negative. I looked at the wiring diagram. The aux battery isnt needed.
@@JeepingMo I just spoke to the owner of Genesis that manufactures Genesis dual battery systems for Jeeps. He confirmed to me that yes you can remove the auxiliery battery this way.
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I followed your video step-by-step to replace both batteries in my '18 JL and it went flawlessly! THANK YOU!
Glad it was a help to you, thanks for reviewing and following the channel. Glad it helped.
Did this today with my son on his 2018 Jeep Wrangler. Very good video which made it dead easy to do. One word of warning, with both batteries disconnected and removed the auxiliary positive terminal touched the frame and sparked which means there must be a capacitor somewhere possibly for memory retention of settings. All worked fine, no settings lost. Seems much easier than removing the wheel and working through the fender as some videos suggest with the possibility of snapping fender clips. Thanks for the video
Thanks for viewing, i have videos of changing it both ways. Either way it sucks.
Thank you for a very informative video. You have tremendous patience I learned some new tips from you today and I loved the use of tie backs for the wiring harnesses. The engineers that came up with this design position for the auxiliary battery should be reprimanded. I can only imagine the labor cost to replace this auxiliary battery once it is out of warranty. Thank God! someone raised the BS flag, and gave the alarm. Some jeep lovers found an easier path to replace this aux battery (via the fender well). All batteries die eventually, in approx 3 to 4 years. So the owner would have to face this labor cost often during owning a jeep that they love over a 10 to 15 year period. Goodness I hope that an (after market engineering/company) or someone fabricates an inner fender access door to allow the access to the aux battery for us Jeep Lovers. Carry On Sir.
I did a follow up video on removing the battery from the bottom also. Thanks for the feedback and channel support.
You have convinced me to add the stop start bypass on my JL and let this battery just sit there for as long as possible.
Thanks for the comments, but please note that the Jeep starts on that battery. It’s used every time you start.
@@JeepingMo I have not looked at the wiring to see if that can be modified. Stop start is a requirement and this was not a good implementation.
@@JeepingMo Are you sure about that? I read on the Wrangler forum it is to run the accessories will in stop mode at a light. It doesn't have the cranking amps of the main battery.
Yeah and unfortunately..
There’s other systems
That need additional voltage
Yes, only an idiot would engineer a vehicle with this type of setup just to change a battery.
Very good video real informative I'm a welder not a mechanic but with that video almost anyone could do that job thank you very much 👍
Thanks, what do you weld?
For the last 55 years I have been at a shop my dad and I started we used to build big tanks and repair a lot of equipment, but now a days we fabricate a lot of the steel parts used in the woodworking industry, like brackets and counter tops large support bases for desks and table assembles, at 69yrs old i still work just not as hard as i used to , but I still drive jeeps i don't plan on growing up i still want to have fun
Good video. If you have to do it again it is easier to pull the fender off and do it from the bottom. 4 or 5 screws for the fender and a push clip. 1 connector then 3 bolts on the battery case. No need to remove the fuse box and not bend a pin Great video though
Great video. Working on a 2018 Wrangler and it has start/stop but there is NO auxiliary battery! 2.0 L engine. When were the batteries introduced? I sort of don't care and somewhat happy but I am suspicious that something may be amiss and although it has taken about 3 years, I feel the main (only) battery didn't have that much service.
Thanks for the comments, that battery was put in for the 2018 JL. i did pit out an update on the video. There is another way to change it.
For those that don't want to mess with the fuse box you can access the auxiliary battery from below by removing the passenger fender.
Thanks for the comment, yes you can. I don’t want to hang the battery from the terminals. Also make sure you have extra clips. It comes down to preference, I have had dealers tell me both ways. Hope we have you as a subscriber.
@@JeepingMo subscribed. You can lower it without hanging it by the wires but yes, my extra 25 count Amazon clip supply is getting low. I prefer the fender route because one wrong move with the fuse panel and having a fuse fail on you or something else electrically on the trail is worse news than replacing a 28 cent fender clip.
Yes, that is the correct way. Messing with these harnesses in the PDU is a disaster waiting to happen.
Thanks
Great and Amazing video. I never knew the JL had a second battery, so learn something everyday. I plan on taking off my interior trim around my steering wheel and have to take out my airbags both driver and passenger side. Should I disconnect the secondary battery as well to prevent the airbags from going off?
Thanks for the good comment, i don’t know about the airbag.
if i change out the aux battery will i have to change the main battery too?
Only if it’s bad. You can have it tested. I did an update for the aux battery, please check it out first. Thanks for viewing.
What do you mean the dealer waited you out on the warranty were they dragging their feet.
Great video, Thanks
Thanks for viewing. There is another video on the channel that i change it from the bottom. Please check it out. It’s easier
Question, could you run a battery tender cable from that battery.
Thanks for the question, truthfully I don’t know. If you look at my other video or stop start issues. I also show you where you can change the battery coming up that’s much easier
Thank you for the details!
I hope it helped, we made a follow up to this video last week you might want to check it out also thank you
@@JeepingMo thank you! I will check it out. Looks like it’s time to replace mine.
how to jump start jeep JL if the small battery is dead ?
I’m not sure which post you use, but you can actually jumpstart your jeep from the large battery by putting a jumper on the fuse box. But you’ll have to look up which post. Thanks for your comment viewing and subscribing. Let me know how it goes thank you
Thank you, very informative video.
Thanks
muchas gracias por compartir tu experiencia con nosotros de la segunda batería del jeep sí que esta escondida 👌
Who designed this? Ugh thank you!
It’s something else, glad you liked it.
Always disconnect the ground ( negative) first, you disconnect ed the positive first,. Good way to burn up some electronics
did you get check engine light when the battery when bad?? if yes whats the code?
Thanks for the question, I got mostly stop start error message. Then it pulled out power noticeably. The dealer was chasing parts, it took 2 years until I replaced it. Thanks for the question and subscribing. But I was also having cam phaser problems at the same time .
What battery (brand&model)did you buy for the aux battery
?
Thanks for viewing, I am not sure of the brand, I bought it at Napa auto parts .
i made mistake on removing the big battery positve toches the ground after i returned the batt my system go abnormal and wont start i think i short circuited the aux batt
Did you check all your fuses
Do you recommend the 2.0l ?
Thanks for the question, I have drove both the 2L and 3.6L. I prefer the 3.6, I would suggest driving both if your looking. I am not sure how it would do after lifting it. Thanks for viewing and subscribing
Put in the new aux battery positive then when I go for the neg it sparks .. it sure what I’m doing wrong
I would double check your connection, I think one of your connections are backwards.
@@JeepingMo since it is a live circuit a little spark is normal ?
@@PatrickHolmesHollywood it might. I would check it and if you have a multimeter I would check it.
@@JeepingMo I think I may have found the solution like you said. When replacing the aux battery do neg first then positive ?
@@PatrickHolmesHollywood glad you found the problem, thanks for the channel support. Hope your a subscriber. Can I ask where your from. Look me up on Facebook or Instagram.
In the last two days I have been getting this funny message after starting my 2019 JL that the auxiliary switch bank is not available because the battery is charging and the vehicle 🚗 start stop function does not seem like it’s working last night driving home I noticed the engine didn’t shut off at the lights. Could this be the little battery? Excellent instructional video! PS Did it correct the problem.
I had many issues on my Jeep, and the battery was just one of them. I also had cam fazers going bad, that was making the charging system not work properly. It was a mess that took me a year to work through. Good luck on your Jeep.
Did it say start/stop not ready
@@Aceinfinity-le8zc I don’t remember what it said it was too long ago but I tested the charging system and both batteries 🔋 were testing bad and I had both replaced by the local Jeep dealership
If the state of charge is below seventy percent (I assume this is both batteries together) than the stop/start system will not work, this is how it is designed. There is a internal battery sensor connected to the positive terminal of the main battery, the computer does a test on state of charge every time you start the vehicle. If it is below seventy percent you will get a alert on the dash that the battery is still charging and stop/start is not available. This will give you a idea of how much life is left in your batteries. If under warranty the dealership will not replace batteries until state of charge is below fifty one percent. This is where I am at now. Two years and 22000 miles. My guess is my batteries will last past the three year 36000 mile warranty.
This is intense. I think I'll just take it to the shop instead of doing it myself. I don't trust myself enough
I also have a video showing how to go up through the fender. Please check it out, we discovered this after we change it the other way it’s much easier. Here’s the link.
Replace Aux Battery, Update.
th-cam.com/video/cll_poET5ho/w-d-xo.html
Ordered a new JL in July its supposed to be here by the 10th of December five months later. I now understand why it took so long it took them 3 months to install this stupid second battery. What an asinine design.
My JT is one year old..
And my Auxiliary batteries dead ☠️
Really.. 1 year..?? Hopefully i can get
A lithium or dry cell for it
You might get it replaces under warranty. Is the light coming on, or not starting.
@@JeepingMo just replaced it
This morning.. jeep wants to hold
It there..or schedule way off in the future… but the 2021 JT has aux battery placed up higher.. didn’t have to dig down into the wheel well..👍
@@mikekosar6135 hope you’re rig is fixed and the video helped. 👍👍
@@JeepingMo absolutely..!!
Why not just eliminate the auxiliary battery by connecting the aux positive cable to the main battery positive cable then completly remove the aux ground cable because you wont be needing that any more then you can throw that auxiliary motorcycle battery away. I would only do this if you dont use stop start system, but the stop start system will still function if you want it to.
Thanks for the comment, and watching the video. I would need to find out if it would be that easy. That’s a complicated system to short out. That is a little out of my depth. Electronics is not my thing.
@@JeepingMo Mine either. But i learned the aux battery only runs the accessories when the jeep is at a light and the engine is shut off. It does not start the jeep. Its not needed if stop start isnt on. I dont use stop start. When you change your system to a full fledged dual battery system you are doing the same thing. Youre connecting the positive aux cable to main battery cable and removing the aux negative. I looked at the wiring diagram. The aux battery isnt needed.
It makes working on it a little dangerous. When you take the leads off they are still hot.
@@JeepingMo I just spoke to the owner of Genesis that manufactures Genesis dual battery systems for Jeeps. He confirmed to me that yes you can remove the auxiliery battery this way.
@@danielsmith5351 that’s good information, thanks for finding that out 🤙🤙🤙
Dude, the music, it’s horribly loud and not necessary
Thanks. That was the early days of youtube. 🤦🏻. I did put up an update to that battery, and an easier way to pull it. Thanks for the comment.
Glad I have a Jk wtf is that..
James Ross in the JL and JT they use the stop start system. It takes a secondary battery.