plisken
Well-Known Member
- Thread starter
- #1
I know there are a multitude of dual battery, ESS and voltage threads but anyway, here’s the deal, I’ve had the Jeep from the end of June but due to a few issues (mainly an alarm issue), she was in the dealers for almost two months, so I don’t have a great deal of miles under my belt. She is a 2020 Rubicon with 8000 miles or so and I feel as though there is something not quite right with the battery, batteries or the charging system.
The stop/start system only worked intermittently when I got the car and did on at least once occasion show the Service Stop/Start system fault. As this is a UK car, there is apparently no stop/start menu feature, so there is no way to find out why the system would not engage under normal circumstances.
Anyway…
When driving, the voltage normally shows 14.4v +/- 0.1v and when the stop/start system engages, it drops pretty quickly to 12.1v (haven’t yet seen it drop below 12.1).
If I’m sitting in the car, with the radio on perhaps but the engine not running, I can observe the voltage and it also drops to 12.1 volts, albeit at a slightly slower rate than if the stop/start had engaged.
I have never seen the driving voltage increase when I am coasting and similarly, never seen it reduce when on the power, it is almost always around 14.4v. The only exception to that would be after maybe after a couple of consecutive runs (20 miles), where it would perhaps drop towards the 14.2v mark.
It may be worth noting that recently, even though the voltage showing when driving is 14.4v, the stop/start seems to be working as expected.
In the past, I would consider anything greater than 14v while the engine was running to be good but similarly, have read that this should not be the case with these Jeeps.
Anyway, thoughts would be appreciated. I’m not so keen on going back to the dealers yet again, given the time it took to diagnose my previous problem, not to mention the wait for the replacement part. I'd much rather just go out and buy two batteries and replace them, if I knew beyond doubt that they were suspect and part numbers (specifically for the small one).
The stop/start system only worked intermittently when I got the car and did on at least once occasion show the Service Stop/Start system fault. As this is a UK car, there is apparently no stop/start menu feature, so there is no way to find out why the system would not engage under normal circumstances.
Anyway…
When driving, the voltage normally shows 14.4v +/- 0.1v and when the stop/start system engages, it drops pretty quickly to 12.1v (haven’t yet seen it drop below 12.1).
If I’m sitting in the car, with the radio on perhaps but the engine not running, I can observe the voltage and it also drops to 12.1 volts, albeit at a slightly slower rate than if the stop/start had engaged.
I have never seen the driving voltage increase when I am coasting and similarly, never seen it reduce when on the power, it is almost always around 14.4v. The only exception to that would be after maybe after a couple of consecutive runs (20 miles), where it would perhaps drop towards the 14.2v mark.
It may be worth noting that recently, even though the voltage showing when driving is 14.4v, the stop/start seems to be working as expected.
In the past, I would consider anything greater than 14v while the engine was running to be good but similarly, have read that this should not be the case with these Jeeps.
Anyway, thoughts would be appreciated. I’m not so keen on going back to the dealers yet again, given the time it took to diagnose my previous problem, not to mention the wait for the replacement part. I'd much rather just go out and buy two batteries and replace them, if I knew beyond doubt that they were suspect and part numbers (specifically for the small one).
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