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  #13  
Old 04-25-2012, 07:01 AM
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Re: Charging System Light

The manual mentions that it's a reconfigurable red tell-tale ... so the big question is how do you get it reconfigured?
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  #14  
Old 04-25-2012, 06:03 PM
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Re: Charging System Light

The reconfigurable tell tale are the two lights on the bottom left of the EVIC display, on the left, red and in the centre, amber. When you start the car they both come on. The red display on mine is the electronic throttle warning. It looks like the old school choke symbol. The light is a digital display able to present a number of different warnings (reconfigurable as opposed to fixed (unreconfigurable) bulbs lighting up an image such as the park brake symbol). if you have a red light displaying something when you start your car then the light is working.

The red warning light at the bottom left of the EVIC is where the charging light should display when needed.

This takes me back to my original comment, until proven otherwise I believe the system will work correctly. If someone can be bothered to remove the serpentine belt and run the battery towards failure, I believe the charging warning will come on. How long before that battery runs out of charge remains to be seen.
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Old 04-25-2012, 07:01 PM
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Re: Charging System Light

So, if Mendo is correct, the Charging Light is really a low voltage warning, and would light up if the volatge in the battery dropped below a certain point.
Still, one would have thought that it would light up to confirm the light was functional as per all the other warning lights.
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  #16  
Old 04-25-2012, 07:11 PM
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Re: Charging System Light

When I was a mechanic, it was handy to know when the alternator was not charging.
If the idiot light only comes on with low voltage then it has already failed, as there is not much you can do except grind to a halt. It would be much more practical if the light did what every other cars charging light does and that is warn you that the system is not charging. This could result in not using accessories like Aircon or radio to eek out a bit more distance if you are far from a service center.
I cannot believe that Jeep with so much experience building cars would have such a massive oversight.
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  #17  
Old 04-25-2012, 09:29 PM
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Re: Charging System Light

On start up I see one or all of the following symbols that the Manual mentions that should light up at start up ,that being Oil pressure,Electronic Throttle and Engine temp, the Charging System light is the only one I have never seen
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  #18  
Old 04-25-2012, 10:13 PM
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Re: Charging System Light

This guy had the opposite problem ... http://www.jeepforum.com/forum/f309/...light-1257993/
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  #19  
Old 04-26-2012, 02:19 AM
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Re: Charging System Light

Quote:
Originally Posted by allypally View Post
So, if Mendo is correct, the Charging Light is really a low voltage warning, and would light up if the volatge in the battery dropped below a certain point.
Still, one would have thought that it would light up to confirm the light was functional as per all the other warning lights.
Quote:
Originally Posted by ENFORCER View Post
When I was a mechanic, it was handy to know when the alternator was not charging.
If the idiot light only comes on with low voltage then it has already failed, as there is not much you can do except grind to a halt.
I'm not saying it is a low voltage warning

Here's the extent of my limited knowledge, I know the alternator on my 1978 Kingswood was charging the battery all the time. I know the alternator on my 2004 Falcon is not charging the battery all the time (in the interests of fuel economy). I assume the alternator on the Jeep is even more complex.

I am not convinced the system is broken because it failed to notice the alternator was not charging after only a very short period of time. IMO old mate did not run the engine long enough for the required drop in voltage (or time period) to engage the clutch/ switch for the system then to realise its not charging.

Someone more mechanically minded might be able to provide further info.

Attached more commentary re light Lights at Start Up

And this one should clear up any concerns.... Charging system warning light came on right when I drove off the lot

Remember just because its on the internet its not always true.
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Old 04-26-2012, 04:41 AM
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Re: Charging System Light

Its not like the old times.

Due to fuel economy nowadays the alternator is charging depending on the status of the battery. If its charged, no alternator activity. If you have energy excess, eg downhill or braking, the alternator is "fired up" and starts charging. If the battery is drained, it starts charging on engine energy. If you need full engine power for acceleration, the alternator is disabled. Thus pretty complex alogarythms...

Thus, the good old idiot light does not work any more, so we are at one point more dependent on a piece of hopefully working software. Usually the system starts to behave erratic on low voltage, due to the advanced energy management the cars operate a long time even on dying batteries, wich then surprisingly cease to work on a single cold morning...

Happy Day

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  #21  
Old 04-26-2012, 06:02 AM
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Re: Charging System Light

Quote:
Originally Posted by curio View Post
Its not like the old times.

Due to fuel economy nowadays the alternator is charging depending on the status of the battery. If its charged, no alternator activity. If you have energy excess, eg downhill or braking, the alternator is "fired up" and starts charging. If the battery is drained, it starts charging on engine energy. If you need full engine power for acceleration, the alternator is disabled. Thus pretty complex alogarythms...

Thus, the good old idiot light does not work any more, so we are at one point more dependent on a piece of hopefully working software. Usually the system starts to behave erratic on low voltage, due to the advanced energy management the cars operate a long time even on dying batteries, wich then surprisingly cease to work on a single cold morning...

Happy Day

Achim
A quick way to confirm if it's charging is put a multimeter across the battery terminals and see if the voltage rises when the engine is running.

I would expect that the alternator will charge straight after an engine start, as that's when the heaviest drain on a battery occurs. Especially from cold.
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  #22  
Old 05-02-2012, 02:52 AM
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Re: Charging System Light

The thing is:

The old idiot light was indicating the current wich charged the battery. Once the current stalled, you have had an immediate information that the alternator stopped charging, leaving you sometime to drive on the residual power of the battery.

The new systems seem to monitor the voltage. Thus you get the information when the voltage is already too low, so no more residual reaction time.

And the advanced starting management of the engine gets you the thing running even on an almost dead battery, since usually the engine starts after 1-2 cranks.

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  #23  
Old 05-02-2012, 05:02 AM
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Re: Charging System Light

I think what is being said:
The modern cars have smart alternators and will not continally charge like the old school ones. The video only shows a short time with the belt disconnected and would possibly not be enough time for there to be any voltage drop. If the guy on the video loaded up the system with lights and HVAC it would draw down enough to trigger the system to put the charge light on.
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  #24  
Old 05-02-2012, 06:46 PM
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Re: Charging System Light

But alternators never charged all the time unless the regulator was faulty. Regulators have been used for ever so they do not overcharge batteries.

I'm going to experiment when I get mine and see if I can make it ight up.

The test in the video was too simplistic however, I agree on that. Having an engine idle for a few minutes is not a significant load once it's started.
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