rbranst
New Member
- First Name
- Ryan
- Joined
- Apr 2, 2021
- Threads
- 0
- Messages
- 1
- Reaction score
- 3
- Location
- Shawnee, Kansas
- Vehicle(s)
- 2018 Jeep JL Rubicon
First - thanks to Jebiruph for this thorough thread. I can't see digging into an ESS issue without referring to this first. I wanted to pass my story along.
I encountered a dead battery and had to be jumped and thought it was a fluke. I got home and started the car back up just to make sure I was good. Next morning, battery was dead. I left the JL at home and drove another car. I picked up a brand new Optima DH6 on the way home from work that night and put it in. Car was still dead. It was at this point I began learning about the aux battery and realized I probably needed to replace that one too. Once I did this, the car would start again but it would never engage ESS and always gave me errors about either "Battery Charging" or "Battery Protection Mode". In the process of investigating all of this, I trickle charged for a day, but it made no difference. Aux battery voltage was fine, but main was 10.5-11 on the new Optima! I discovered the negative lead to the aux was corroded at the main battery Neg terminal. I cleaned it really good, trickle charged again and now my start stop worked briefly. Finally after a few days I began to suspect my main battery, it was always at 10.5V after long drives. I returned the Optima DH6 for a replacement. Once installed and the terminals lubricated everything works perfectly.
The overcomplicated system actually hid bad brand new battery! That's the one thing I would like everyone to get from this post. The Aux was definitely bad, but the bad main replacement I got really screwed up my troubleshooting. I was looking at alternator voltage, considering a battery sensor replacement, bad wiring harness, etc. Never considered a brand new Optima being bad!
I encountered a dead battery and had to be jumped and thought it was a fluke. I got home and started the car back up just to make sure I was good. Next morning, battery was dead. I left the JL at home and drove another car. I picked up a brand new Optima DH6 on the way home from work that night and put it in. Car was still dead. It was at this point I began learning about the aux battery and realized I probably needed to replace that one too. Once I did this, the car would start again but it would never engage ESS and always gave me errors about either "Battery Charging" or "Battery Protection Mode". In the process of investigating all of this, I trickle charged for a day, but it made no difference. Aux battery voltage was fine, but main was 10.5-11 on the new Optima! I discovered the negative lead to the aux was corroded at the main battery Neg terminal. I cleaned it really good, trickle charged again and now my start stop worked briefly. Finally after a few days I began to suspect my main battery, it was always at 10.5V after long drives. I returned the Optima DH6 for a replacement. Once installed and the terminals lubricated everything works perfectly.
The overcomplicated system actually hid bad brand new battery! That's the one thing I would like everyone to get from this post. The Aux was definitely bad, but the bad main replacement I got really screwed up my troubleshooting. I was looking at alternator voltage, considering a battery sensor replacement, bad wiring harness, etc. Never considered a brand new Optima being bad!
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