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06-10-2017
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I just registered
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Join Date: Jul 2014
Posts: 5 What Jeep do I drive?: WK2
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Smart Alternators
G'day Lads,
Does Jeep Jks specifically 2014 model have smarts alternators..?
Chad
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08-10-2017
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CrawlerStar
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Join Date: Jan 2008
Location: Adelaide
Posts: 449 What Jeep do I drive?: JK
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yes, they have been since 2007, but with Chrysler ECU software they're a drawback and killing the outstanding battery (CRD)
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08-10-2017
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CrawlerStar
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Join Date: Sep 2014
Location: Melbourne
Posts: 267 What Jeep do I drive?: JK
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my 07 diesel unit did not look very smart when I pulled it out, usual amount of wires and no weird looking crap hanging off it, BUT I bet whatever it hooks up to has voodoo stuff attached.
It has an overrun pulley which will rattle before it shits itself.
Optima battery must be kill proof, its a few years old now..
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08-10-2017
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CrawlerStar
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Join Date: Jan 2008
Location: Adelaide
Posts: 449 What Jeep do I drive?: JK
Likes: 2
Liked 8 Times in 6 Posts
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Optima D31A is used in USAF ground support equipment and reported to last 8 years on average. My JK chewed 3 of them lasting under 3 years each dying always after hot days. I worked out the problem and kinda fixed it: http://www.ausjeepoffroad.com/forum/...66&postcount=1
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09-10-2017
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No Winching
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Join Date: Aug 2009
Posts: 3,481 What Jeep do I drive?: JK
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No...... its a plain constant output unit. Controlled by the TIPM.
If your in doubt put a volt meter ( or OBD reader ) on it and go for a long drive - you'll see the voltage never falls below 14ish ....
__________________
It seemed like a good idea at the time........
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09-10-2017
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I just registered
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Join Date: Jun 2016
Posts: 17 What Jeep do I drive?: JK
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Liked 6 Times in 6 Posts
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On the 3.6's the alternator output is controlled by the PCM.
There is a table in the software for it.
Output is regulated versus battery temp not ambient temp.
As the battery gets hotter, charge voltage is lowered...
Quote:
Originally Posted by MightyMouse
No...... its a plain constant output unit. Controlled by the TIPM.
If your in doubt put a volt meter ( or OBD reader ) on it and go for a long drive - you'll see the voltage never falls below 14ish ....
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Last edited by blownjk; 09-10-2017 at 11:59 AM.
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09-10-2017
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No Winching
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Join Date: Aug 2009
Posts: 3,481 What Jeep do I drive?: JK
Likes: 98
Liked 504 Times in 291 Posts
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Quote:
Originally Posted by blownjk
On the 3.6's the alternator output is controlled by the PCM.
There is a table in the software for it.
Output is regulated versus battery temp not ambient temp.
As the battery gets hotter, charge voltage is lowered...
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That's not what a so called "smart alternator" does...... they actually shut down periodically and the vehicle runs on the battery. Also the battery charge level can vary significantly from traditional charging systems which always aim for a full charge. As you can imagine this can cause issues with second battery systems so its a topic of some importance with some vehicles when fitting second batteries.
__________________
It seemed like a good idea at the time........
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11-10-2017
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I just registered
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Join Date: Jun 2016
Posts: 17 What Jeep do I drive?: JK
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I thought that stating that it is in fact PCM controlled would preclude it from being called a "smart alternator". 
Quote:
Originally Posted by MightyMouse
That's not what a so called "smart alternator" does...... they actually shut down periodically and the vehicle runs on the battery. Also the battery charge level can vary significantly from traditional charging systems which always aim for a full charge. As you can imagine this can cause issues with second battery systems so its a topic of some importance with some vehicles when fitting second batteries.
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11-10-2017
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CrawlerStar
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Join Date: Mar 2014
Location: Beechworth, Victoria
Posts: 388 What Jeep do I drive?: JK
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Liked 131 Times in 77 Posts
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Mightymouse is right, it's a traditional type of alternator with the voltage regulation done by the TIPM. The TIPM has some sort of feedback from the battery, presumably temperature. I have potentiometers on my dash and voltage seems to be highest on a hot day, but there is not really any logical trend that I've noticed to be honest. Voltage seems to bounce between 14.5 and 15.3 (2009 CRD) most of the time at the higher end (that's what kills batteries).
The system is perfectly suitable for a VSR dual bat system if that's what you're getting at.
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