Dead Rubicon - Help Please

[TroyBaise]

I have a 2018 Rubicon. I had the 2nd battery replaced 2 months ago. I believe the person installing it left the large positive cable that connects the battery's together un-hooked. The jeep is totally dead now with not one light coming on. I replaced the main battery and still no signs of any life. Any comments I would appreciate. I am charging the 2nd battery now taking off the negative cable that is going to the auxiliary battery and hooking the positive to the main battery. Is their any fuses that would totally kill the vehicle? If the auxiliary battery is dead should that stop all lights and functions? Thoughts? Thanks Troy

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[Gregj]

I would check the high amp fuse array, it’s on the side of the fuse box with six or seven wires connected to it. Not uncommon for them to be blown after a battery swap.
Gregj

 

[Flip]

My Jeep doesn't have the auxiliary battery but if I remember correctly if you disconnect the ground from the auxiliary battery to the main battery and pull #42 fuse you can take the auxiliary battery completely out of the equation. Put a full charge on your main battery and you should be back in business if it is in-fact the auxiliary battery that's draining your system.

I'm just not 100% sure which fuse it was I think it's #F42 fuse.

 

[Jebiruph]

Check the N3 fuse of the fuse array and/or swap the wire connected to the N3 terminal to the N4 terminal. If the issue is a blown N3 fuse, moving the wire to the N4 terminal will get it going.

 

[TroyBaise]

Switching the breaker worded after I disconnected the aux batt. With the aux hooked up it wouldn't work and showed a red dot on the dash. Is there a way to charged the aux batt from the top with out removing it. Thanks for the help Troy

 

[TroyBaise]

Check the N3 fuse of the fuse array and/or swap the wire connected to the N3 terminal to the N4 terminal. If the issue is a blown N3 fuse, moving the wire to the N4 terminal will get it going.

Switching the breaker worked after I disconnected the aux batt. With the aux hooked up it wouldn't work and showed a red dot on the dash. Is there a way to charged the aux batt from the top with out removing it. Thanks for the help Troy

 

[Rhinebeck01]

Switching the breaker worded after I disconnected the aux batt. With the aux hooked up it wouldn't work and showed a red dot on the dash. Is there a way to charged the aux batt from the top with out removing it. Thanks for the help Troy

To charge just the Aux battery .... Place battery tender/maintainer pos clamp on the Main battery positive terminal and the battery tender/maintainer's neg clamp and hook that to the Aux neg cable that resides on the Main's neg side..

DO disconnect the Aux neg cable on the Main's negative side and then hook up the battery tender/maintainer.

You are gonna ask which cable is the Aux negative on the Main... It is the smaller diameter of the two cables connected to the Main's neg. side.

 

[Upnarms]

Ok, just fyi and from lots of others experience, if you want to keep both batteries replace BOTH at the same time. Replacing only one can permanently damage the other. Then when you replace that one you damage the other! It's stupid but I've heard it to many times. Take the opportunity to decide if you want to do the aux delete and call it good.

 

[Dbrown1088]

I had the same problem a year ago, 2018 rubicon manual, replaced the aux babattery month later the whole thing died, no power anywhere. Replaced main, nothing. Towed it to dealership, they said I bought a bad aftermarket aux battery and it burned out a section of the fuse array. $300, replaced 1/4 of the array over the aux battery and charged me $140 for an aux battery. This is why no-one likes dealerships. Aftermarket battery was $60, still will do aftermarket next time.

 

[mwilk012]

I had the same problem a year ago, 2018 rubicon manual, replaced the aux babattery month later the whole thing died, no power anywhere. Replaced main, nothing. Towed it to dealership, they said I bought a bad aftermarket aux battery and it burned out a section of the fuse array. $300, replaced 1/4 of the array over the aux battery and charged me $140 for an aux battery. This is why no-one likes dealerships. Aftermarket battery was $60, still will do aftermarket next time.

I doubt it had anything to do with the battery, you likely blew the fuse by shorting the positive cable to chassis.

 

[Dbrown1088]

I doubt it had anything to do with the battery, you likely blew the fuse by shorting the positive cable to chassis.

Then how did I drive for a month before the problem?

 

[mwilk012]

Then how did I drive for a month before the problem?

Was it the N3 fuse that was blown?
How many miles a day did you drive it?

Also where are you getting these cheapo batteries?
https://www.oreillyauto.com/detail/...ttery-group-size-400/ssbq/aux14?q=aux14&pos=0

120 is standard pricing, before tax.

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