The aux battery. If your voltage reads above battery voltage (13+) at all times with the engine running, one or both batteries are failing.I'm not sure what the problem is. New Batt has 12.6V with engine off. With engine running, voltage is 14.2 (no load) and no less than 13.8 with load (headlights, radio, etc.).
My plan is to dig out the Aux Batt tomorrow and test it. Whoever designed the Aux Batt at MOPAR should be ashamed of themselves!The aux battery. If your voltage reads above battery voltage (13+) at all times with the engine running, one or both batteries are failing.
Having 13V+ while engine running was my first thought of a problem. However, there were many other forums/YouTube vids that claims this to be the norm.The aux battery. If your voltage reads above battery voltage (13+) at all times with the engine running, one or both batteries are failing.
unfortunately, failing batteries is the norm.Having 13V+ while engine running was my first thought of a problem. However, there were many other forums/YouTube vids that claims this to be the norm.
@CarnageMy plan is to dig out the Aux Batt tomorrow and test it. Whoever designed the Aux Batt at MOPAR should be ashamed of themselves!
Yeah...saw a vid about pulling out the fender flare to get (easy) access to that side of the engine compartment. My concern are the tabs breaking. I don't think it's difficult digging out the Aux Batt from underneath the PDC...just a bunch of steps to worry about. Thanks!@Carnage
I encourage you to go easy so to speak..... research... first, the best way to get to and change out the Aux battery...
Recommend you do not dismantle the PDC to get to the Aux.. Do a fender flare pull or peel back the fender liner to access the Aux battery / it holding container.
IF, you plan to continue to run with both the Main and the Aux batteries and not use a fused bypass jumper to bypass the Aux and run with just the Main, that you would be best served changing out the Aux battery (cost $107+-) now / at the same time you change out the Main on your 2018 JL.
IF you want to learn lots in regard to the JL's, dual battery system, do a forum search for any and all posts by @Jebiruph. You can take his posts in regard to the dual battery system, to the bank so to speak....
DO, do be really careful in regard to those YouTube videos you mentioned... lots of iffy, piss poor info in many of the YouTube videos out there in regard to the JL's battery(s)../ dual battery system in general.
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@CarnageYeah...saw a vid about pulling out the fender flare to get (easy) access to that side of the engine compartment. My concern are the tabs breaking. I don't think it's difficult digging out the Aux Batt from underneath the PDC...just a bunch of steps to worry about. Thanks!
I found it much easier to cut the plastic rivets out and replace with good old fashioned christmas tree push clips. It's like having the fender on a zipper. Very simple change out of the battery. The main battery is more difficult, it weighs a ton.@Carnage
Well, to go the dismantle the PDC route will take you well over an hour+ and you risk doing pricey damage to the PDC. FCA tells recommends Techs do not go through the PDC but rather do the fender liner peel...
Peel takes less then 15 min to access the Aux battery but you need to replace a few $ worth of plastic rivets. You can buy a rivet gun at Harbor Freight for about $15+- and it comes with the rivets.
You can just pull the fender flare ,... takes less then 10 min. .... is easy easy to do but you need to have about 6 or 7 ($.99) fender flare clips as you usually break 2-4 when you pull the flare.
My preferred way is flare pull. No way would I dismantle the PDC to get to the Aux... Not worth the very pricey, big trouble you could possibly get into doing so... and it is very time consuming to dismantle and then re-assemble. I prefer bottom access to the Aux also!
https://www.jlwranglerforums.com/fo...ent-the-easy-way-pull-the-fender-flare.56807/