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2014 grand cherokee diesel. Why is voltage regulator set at 13.0 volts and not 13.8 to 14.2 volts

Same model in petrol voltage regulator setting 14 volts diesel model 13 volts. Why??

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Because the amp output of the alternator is very high.

The internal regulator may have a popped diode.

Posted on Nov 12, 2014

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Posted on Jan 02, 2017

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SOURCE: Alternator or Voltage regulator

if you can carefully put a metal wrench on the rotating pulley of the alternator and felt a magnetism attracting the metal wrench, then your alternator is charging. if there is no magnetism, then the alternator is not charging...

another test is to measure the voltage on the small wires that went in to the alternator that says "F" for field, it should measure battery voltage...that is the voltage from the regulator..that means your regulator is working...but the altrntor is not..

without that battery voltage, then the regulator is he culprit...



pls be carefull...

hope i was able to solve ur problem..

pls rate me.. tnx, drcool..

Posted on Jul 26, 2008

SOURCE: setting timing on a 2002 jeep grand cherokee

how do you set the timing on jeep laredo 2002?

Posted on Oct 18, 2008

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SOURCE: 1995 Jeep Grand Cherokee - Setting the clock on the NAV radio

go to system settings from main menu you will see clock settings option

Posted on Dec 18, 2008

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SOURCE: battery voltage is very high when driving over 14

Voltage regulator is going bad. Have alternator tested or go ahead and have it replaced. Also this would be a good time to have the battery tested. Usually an alternator that is over charging will "cook" the battery causing it to not charge, not hold a charge, to losing the gel/electrolyte solution due to boil out.

Posted on Jul 17, 2009

wireguy212
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SOURCE: my 1998 jeep grand cherokee isint charging, ive

On the terminal maked"l" you need to put switched power from the ignition[ the problem], will go away.If this is not an option then you can get an alternator repair shop to put a self exciting regulater and it will kick in with a quick rev of the engine,no wireing required

Posted on Dec 08, 2009

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1 Answer

1998 jeep grand cherokee 5.9 v8 charges sometimes then will discharge


Sounds like the battery is dead & not capable of
being charged

You already know the alternator should put out
14.2 volts even with all accy's on

The only thing that changes is the current output
when you load a circuits,not voltage

You may be able to just buy the regulator &
replace yourself

Have to OHM out the diodes when it is apart

You should also check diodes for leakage with
an amp meter with KO/EO

Also check for diode current ripple with engine running

Mar 08, 2013 | 1996 Jeep Grand Cherokee

1 Answer

I have a 1995 Jeep Grand Cherokee with a 4 month old battery.A couple of the power door locks quit working a while back and my husband went out a couple of days ago and sprayed them with WD 40 but they...


check the voltage on the battery with a volt meter, it should be around 12.6 to 13 volts, if not charge battery with a charger, after charge try to start vehicle, if the vehicle starts use your volt meter at the battery again, the voltage should be around 14 to 14.5 any lower and the battery isn't being charged and the alternator should be checked and or replaced to solve the problem..

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2 Answers

How do you check an alternator or a voltage regulator on a1990 ford F250 diesel.


Here is a easy way to do it have a voltage tester on hand///multi meter put the positive to positive and negative to negative you should have engine running your voltage reading should be 12.79 up to 14.29 anything under bad alternator anything over 14.29 is bad that's over charge that usually cooks the battery.And truck not runnig test the battery same fashion your reading should be 12.79 up to 13.29 is good under battery no good.Good luck to you

Jan 31, 2011 | Ford F-250 Cars & Trucks

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When the Jeep was new the volt meter read 14 volts....now the volt meter reads 13 volts with a one year old battery. Since the battery is a 12 volt battery should there be any concern that the volt meter...


It needs to be looked at,hook a volt meter to the battery,and start the engine,turn the ac on high blower,and the head lights on,the alternator should be putting out 13.65 volts to 14.25 volts,if it is any lower than this,replace the alternator,now,if the reading is not the same as in the vehicles volt meter,then the cables,positive and negative need to be replaced,the cables get old,and corrode on the inside and break down,they do not carry the current as they should.Shuold you decide to replace them,go with a larger diameter cable,both positive,and negative.

May 28, 2010 | 1996 Jeep Grand Cherokee

1 Answer

MAY NEW ALTERNATOR PUTS OUT 14 VOLTS WHEN I START THE DIESEL 5.9


the voltage regulator is in the computer,check you battery with volt meter with engine off it should say 12volts then check it again with engine running and it should say 14-15 volts. if not the you will have to take it to a dealer to check the computer,hope this will help you!!!

Apr 19, 2010 | 2002 Dodge Ram 3500 Truck

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I have a 1997 Jeep GC Laredo. I believe the alternator is bad. How can I be sure of this?


One way to check is to put a multimeter on the battery before you start it and record the voltage then start the vehicle and see if the voltage goes up when it is revved or down. If the voltage does to around 14 volts then the regulator in the alternator is working

Mar 03, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Ok, I just got a new battery and coil ignition bwd.I also had my alternator re-built about 2 weeks ago,but my battery light still pops on when i turn the headlights on!my belts seem to be tight enuf. is it...


if you have a multi meter,
check voltage at battery with car running,should be at least 13-14 volts,
now turn on fan motor to high,flashers on,radio on, and check voltage at battery,regulator should have adjusted voltage to handle the load,should still be 13-14 volts,
now turn all that stuff off,and turn on headlights and recheck battery voltage,if below 13-14 volts replace regulator,if voltage is spiking higher than 14volts replace regulator.you do not need other belts.

Dec 10, 2009 | 1986 Chrysler Fifth Avenue

1 Answer

1993 Grand Prix, 3.1 L Engine, when I start it up voltage regulator shows 12 volts , when I turn on the headlights it goes to 14 volts. I have checked the alternator & starter. Both ok.


Have your battery load tested to make sure it's OK...14volts is the high limit for charging...If reading dash gauge, it's better to use a volt meter directly connected to the battery to get more accurate readings. What is the voltage with headlights and heater turned on (should be no less than 13 volts) I suspect that your battery may be at the end of it's service life but accurate testing is necessary to verify this!!

Mar 24, 2009 | 1993 Pontiac Grand Prix

1 Answer

Battery charge spiked up on 1994 jeep grand cherokee ltd.


check the battery cable connections, are they clean and tight? This can cause the charging system to spike and go into the 16-17 volt range, the other thing is a problem with either the alternator or the voltage regulator, a diode that is failing can cause this issue.

Dec 18, 2008 | 1993 Jeep Grand Cherokee

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