Z case fuse array replacement, question

[lsalaz18]

I need to replace the z case fuse array, as the N3 fuse is blown.
My question is after disconnecting the main battery do I need to also disconnect the auxiliary battery, to change out the fuse array?

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[Hootbro]

Yes, need to disconnect both.

 

[lsalaz18]

Yes, need to disconnect both.

So after replacing fuse array then replacing auxiliary battery (making sure cables do not touch anything or each other) is there anything else I need to watch out for to make sure the N3 doesn’t get damaged.

 

[LouisvEarlleJT]

So after replacing fuse array then replacing auxiliary battery (making sure cables do not touch anything or each other) is there anything else I need to watch out for to make sure the N3 doesn’t get damaged.

Do you know what caused it to fail? If that hasn't been addressed you're likely to pop it again.

 

[lsalaz18]

Do you know what caused it to fail? If that hasn't been addressed you're likely to pop it again.

I am not sure what caused it to fail.
I was at a red light when the ess kicked in and I pushed the button to disable it. When it started up the auto stop/start and the electronic throttle control icons, light up on the dash. Light turns green, I started moving and then I got a the message vehicle will stop soon, pull over followed by everything on the dash light up and finally the jeep died. Luckily I had pulled over in a safe spot. The dash was going crazy along with the windshield wipers.

I disconnected and tested the main battery and it was drained. So I got a new one and tried to turn it on and it did but once on it was shaking and wouldn’t go into gear.
After a quick google search, I found it might be the N3 fuse. I moved the cable from N3 to N4 and the jeep started like normal, except for a check engine light.
Once I got it home, I checked the aux battery and it read 83% charge. I am not sure if it normal for it to have a charge since the N3 fuse was probably failing before it completely blew. Was the aux draining the main?
Anyways both batteries are on a trickle charger and a fused array was ordered.

What I am trying to figure out if how to make sure the aux battery doesn’t give the jeep power, in order to not blow the N3 fuse when replacing the fuse array.

 

[LouisvEarlleJT]

I am not sure what caused it to fail.
I was at a red light when the ess kicked in and I pushed the button to disable it. When it started up the auto stop/start and the electronic throttle control icons, light up on the dash. Light turns green, I started moving and then I got a the message vehicle will stop soon, pull over followed by everything on the dash light up and finally the jeep died. Luckily I had pulled over in a safe spot. The dash was going crazy along with the windshield wipers.

I disconnected and tested the main battery and it was drained. So I got a new one and tried to turn it on and it did but once on it was shaking and wouldn’t go into gear.
After a quick google search, I found it might be the N3 fuse. I moved the cable from N3 to N4 and the jeep started like normal, except for a check engine light.
Once I got it home, I checked the aux battery and it read 83% charge. I am not sure if it normal for it to have a charge since the N3 fuse was probably failing before it completely blew. Was the aux draining the main?
Anyways both batteries are on a trickle charger and a fused array was ordered.

What I am trying to figure out if how to make sure the aux battery doesn’t give the jeep power, in order to not blow the N3 fuse when replacing the fuse array.

Well that’s good and confusing. The aux shares a ground with the main battery so it will need to be disconnected, just to be safe.

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