2011 santa fe 3.5 V6 CHARGING VOLTAGE - Hyundai Forums : Hyundai Forum
 
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post #1 of 6 (permalink) Old 06-12-2019, 07:18 AM Thread Starter
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gford
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2011 santa fe 3.5 V6 CHARGING VOLTAGE

My santa fe died from a dead battery and the alternator was changed. I noticed that at idle the alternator will not charge unless there is a load applied, ie headlights or wipers turned on. As soon as a load is applied the alternator kicks in and charges at 14.2- 14.5 volts. When the load is removed the alternator kicks out. I have never seen this before on any vehicle I have owned.

I have read on hyundai forums that the 2011 santa fe has a smart charging system that is controlled by the PCM.

My question is do I have a charging problem or is the system working as designed.

Thanks

Gary
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post #2 of 6 (permalink) Old 06-12-2019, 08:08 AM
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Tripplec is an unknown quantity at this point
What was it doing before?

Many newer vehicles do that to minimize load when not needed. If the Headlights, blower, rear defogger etc are on and the voltage holds at 14VDC or higher its working. like a circuit you have I have seen at some negative terminals that control the alternator.

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post #3 of 6 (permalink) Old 06-12-2019, 02:20 PM Thread Starter
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gford
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Update, I was checking the voltage on the SF and at idle it would show 12.75 with nothing on. With lights on it would read 14.27. I disconnected the two wire sensor on the negative terminal and the charging went to 14.27. This is still with nothing turned on. I re plugged the two wire connection and the SF still charges at 14.27 with nothing on. I turned on heated seats, lights, wipers and the voltage dropped to 14.15. I don't know what unplugging and reconnecting the sensor did but its now working full time at 14+ volts.
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post #4 of 6 (permalink) Old 06-12-2019, 03:52 PM
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avisitor is an unknown quantity at this point
It looks like you may have disabled the smart charging system some how.
The smart charging system is a method used to reduce load which in turn reduce gas consumption.
Your gas mileage may be lower due to disabled smart charger.

A dead battery would .... require to checking out the battery.
How old is the battery?

Last edited by avisitor; 06-12-2019 at 03:54 PM.
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post #5 of 6 (permalink) Old 06-12-2019, 06:13 PM Thread Starter
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gford
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The battery died because the alternator stopped charging.
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post #6 of 6 (permalink) Old Yesterday, 12:35 AM
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Quote:
Originally Posted by gford View Post
The battery died because the alternator stopped charging.
How old is the battery?
The battery can be presenting 12 volts
or better to the system but not have enough charge to start engine.
This would fool the charging system.
Was battery load tested?

It is also possible the charging system is faulty??

If the battery is bad
then disabling the smart charging system will give you
a little more time before it fails completely

Also, it is possible that the alternator was not designed to be charging all the time??
Which could make it fail prematurely??

Don't you just love modern technology???

Last edited by avisitor; Yesterday at 12:38 AM.
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