Jeep battery voltage

780

Asked by Guru9TW6C Jan 10, 2018 at 09:39 PM about the 2002 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

So after my battery testing good and
alternator good also i talked to some
people who think the terminals are bad
which makes sense from the sypthoms.
But i also noticed that the battery gauge
flucuates? Can this be caused by the
terminal ends not charging right ?

15 Answers

17,575

any electrical connection should be clean and tight , you need a multitester too see if it matches the gauge , batt, should have 12.5 v at rest and 14+ when it's running for a good alt. if you get good at fixing those jeeps there's plenty of work

6 people found this helpful.
780

We came to the conclusion that the terminal ends need replaced can this be causing the volt gauge to flucuate up and down slowly i assume it can because if the terminal ends are not providing enough conection then they may not be charging correctly

4 people found this helpful.
1,510

Be aware that your alternator may be putting out the voltage, but not the amperage. This happens a lot. Just because it shows 14 volts doesn't mean the amperage is there to support the system demands. Example: lights, ignition, heater, and any other systems you may be using at the time. Check the amperage output on your alternator.

6 people found this helpful.
780

Iv had it tested it autozone and the battery too both are good.i also work there and some guys there told me that there alot of problems with those lead jeep battery terminals which explains alot because sometimes i go to crank car but it dosent start it just clicks but lights and evrrything are on . So then i went to test battery and got a inaccurate reading saying it was 0% charged but it started right up . I think it may bs the starter to but why would the starter cause the volt gauge to flucuate ? So im gonna replace battery terminal ends and go from there

780

So after changing the terminal ends my battery tested good. Alternator passed regulator diodes but failed ouput

1 people found this helpful.
17,575

I believe the internal regulator of the alt. needs an initial jolt to start working , aside from the batt. + it already has

2 people found this helpful.
780

So since it failed the ouput that explains the flucuatinf of the volt gauge because alternator is not outputing enough so guess i need a new alternator correct?

1 people found this helpful.
17,575

if you only have the 12,5 batt, voltage when the motor is running then I'd say the alt, is bad but didn't you have it tested ? scan for codes even if the light ain"t on , How did you test the batt, to get a 0 ?

3 people found this helpful.
780

Yes i tested it again . And it shows the alternator is not putting out enough output i work at autozone so i used our tester and it shows the battery was good but was 0 percent charged , then i tested alternator and it passed voltage regulator and it passed diodes but didnt pass the output test. With the volt gauge flucuation i belive it is bad

1 people found this helpful.
780

Belt is tight tensioner pulley and stuff was replaced not to long ago

780

Ok so iv replaced the alternator but gauge still flucuates from 14 to alittle over could the battery be bad ??

2 people found this helpful.
780

Its normal the volr gauge to flucuate alittle evn while at idle with no electronics on no heat or anything just car running

2 people found this helpful.
780

So its still doing the no crank no start sometmes it will start right up and other times it will not crank or start just one click All elctronics work headlights are normal . But after i try it about 5 to 10 times it will start up ??

4 people found this helpful.
17,575

that sounds like a junk starter , some are junk out of the box , I've found a distributor of OE parts that are a little more than autozoos but not as much as the dealer , this is where I'll be going to get every part I need as I'm sick of crappy parts that last one year or can't take the heat , may be an exorcism needs to be done who knows , good luck

1 people found this helpful.
10

Any follow up I’m having the same issue with mine ???

1 people found this helpful.

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