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Old 06-10-2017
JEEPDADJK  JEEPDADJK is offline
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Default Smart Alternators
G'day Lads,

Does Jeep Jks specifically 2014 model have smarts alternators..?

Chad

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Old 08-10-2017
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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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Old 08-10-2017
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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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Old 08-10-2017
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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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Old 09-10-2017
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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 ....
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Old 09-10-2017
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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...



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Originally Posted by MightyMouse View Post
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 ....
Last edited by blownjk; 09-10-2017 at 11:59 AM.
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Old 09-10-2017
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Quote:
Originally Posted by blownjk View Post
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...
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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Old 11-10-2017
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I thought that stating that it is in fact PCM controlled would preclude it from being called a "smart alternator".


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Originally Posted by MightyMouse View Post
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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