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-   -   Smart Alternators (http://www.ausjeepoffroad.com/forum/showthread.php?t=150171)

JEEPDADJK 06-10-2017 07:39 PM

Smart Alternators
 

G'day Lads,

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

Chad

EugeJK 08-10-2017 02:01 PM

yes, they have been since 2007, but with Chrysler ECU software they're a drawback and killing the outstanding battery (CRD)

mick666 08-10-2017 02:59 PM

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..

EugeJK 08-10-2017 03:39 PM

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

MightyMouse 09-10-2017 08:03 AM

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 ....

blownjk 09-10-2017 11:56 AM

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 (Post 1621382)
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 ....


MightyMouse 09-10-2017 08:51 PM

Quote:

Originally Posted by blownjk (Post 1621399)
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.

blownjk 11-10-2017 06:09 PM

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 (Post 1621431)
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.


Hayesio 11-10-2017 06:29 PM

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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