Htfan
Well-Known Member
- First Name
- Jeff
- Joined
- Nov 18, 2019
- Threads
- 18
- Messages
- 1,183
- Reaction score
- 1,134
- Location
- Orange County, CA
- Vehicle(s)
- 2018 JLU Sport S - 3.6L
- Vehicle Showcase
- 1
- Thread starter
- #1
Thought I would share a cheap/quick mod I've added for peace of mind. I've already had to replace (under warranty) one bad ESS battery that started to drain my main battery before it was replaced.
I know there are other more complicated/expensive options available which include voltage sensors and high Amp relays. This mod is $7 and 5 minutes. It allows the quick disconnect of the ESS battery ground without tools.
If the ESS battery becomes a problem again, just a quick turn of the knob and it's isolated. I also have a fused N1/N2 jumper if I don't want to see the P00FD error code (and "circle A" error on dash).
The other fused line you see across the main battery is not related and just my battery tender connection.
Note: I recently had my PCM updated on TSB 18-092-19 which resolves a number of issues including the way the JL handles a failed ESS battery. EDIT - Make sure that you have a fused jumper on N1 & N2 if you don't have the latest PCM update. Otherwise the jeep won't start with the ESS battery disconnected!
Hope this helps others!
I know there are other more complicated/expensive options available which include voltage sensors and high Amp relays. This mod is $7 and 5 minutes. It allows the quick disconnect of the ESS battery ground without tools.
If the ESS battery becomes a problem again, just a quick turn of the knob and it's isolated. I also have a fused N1/N2 jumper if I don't want to see the P00FD error code (and "circle A" error on dash).
The other fused line you see across the main battery is not related and just my battery tender connection.
Note: I recently had my PCM updated on TSB 18-092-19 which resolves a number of issues including the way the JL handles a failed ESS battery. EDIT - Make sure that you have a fused jumper on N1 & N2 if you don't have the latest PCM update. Otherwise the jeep won't start with the ESS battery disconnected!
Hope this helps others!
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