Question about 2003 Jaguar S-Type

1 Answer

2001 jag S type alternator check

What is the easiest way to check the output of the alternator?
I have my multimeter but the alternator seems rather hidden and hard to get to. my battery is dead and I want to check the alternator before i buy a battery, as it may be that my battery is good still.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Jaguar Master
  • 5,568 Answers

You probably have taken care of this by now (it is courteous to stop by and let us know that by commenting your message) but if you are in the US, most all of the chain parts stores will check it under load for you and surely tell you if either battery or alternator is ill. 

Posted on Nov 16, 2008

  • Steve Allison
    Steve Allison Nov 16, 2008

    Should have mentioned this in my previous comment; 


    For the future; you can check your alternator by measuring across the battery terminals with the engine running.
    Anything you find under ~13 volts is a bad sign. 
    Even at an idle and even if Jag still uses miserable Lucas electrical stuff, most systems will show 13.5-14.2 volts even at an idle and shouldn't rise above ~14.5 at higher RPMs.
    A voltage reading that is too high (>14.5 V) can mean one of two things: the regulator has failed or the battery is suffering from sulphation and approaching end-of-life. 
    The nominal voltage of a fully charged, healthy battery is pretty close to 12.67 volts, spec'ed at 12.6 (2.2 volts per cell).  

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Hi last week my 02 jag x-type every time it sits over nite for some reason go to start in morn and the starter is disabled have to disconnect battery for 72 hrs. to reset otherwise wont start any info on...


check the power in your battery and the output of your alternator. should read 14.3 and battery 12 volts check the battery both before and after you try to start it.

Feb 21, 2015 | 2002 Jaguar X-Type

2 Answers

Battery light on


You probably broke a belt that powers the steering and alternator, you didn't post the car type or year but that's where I wouls start looking

Nov 15, 2011 | Cars & Trucks

1 Answer

Alternator not charging, exchanged with known good one still not charging, checked fuses


When you swapped the alternator, did you also changed the alternator rectifier? Looks like its either rectifier problem or problem with battery itself. Try using battery from another car and see if its charging. This will be the easiest troubleshoot for now. If still not charging then use a multimeter to check the output of alternator.

May 10, 2011 | 1991 Lexus LS 400

1 Answer

Parked my 2001 jag s type and now it will not


It could be the starter, but first check your battery if it does not have a full charge your starter is not getting enouf power to turn over the engine, If the battery is good then you need to replace the starter somtimes with the starter the problem could be intermitten, for further help feel free to call me at 4196891712 for 24/7 support.

Jan 27, 2010 | 2001 Jaguar S-Type

1 Answer

2001 mazda protege battery overheating - bad smell....., not catalytic converter . 1.6l.


You need to get the alternator output checked. If you can smell something like rotten eggs then what you are smelling is hydrogen gas which is explosive !! Batteries get hot and smell because the alternator is charging at too high a level. Check the output with a multimeter across the battery with the engine running. If it reads higher then 14.4 volts, its the alternator and you need to fix it as overcharging of your battery will cause total failure (if it has not already screwed your battery)..

Dec 19, 2009 | 2001 Mazda Protege

2 Answers

Checking alternator on 99 chevy cavalier


The manufacture recommends using the CS electronic generator tester to check alternator output while on the vehicle, but you can go by a AutoZone or advance auto store and they would check the alternator for you.

Oct 02, 2009 | 1999 Chevrolet Cavalier

1 Answer

Jag x type deisel


Hi Wyne

Check all the battery & starter motor terminals, if all OK, a new starter motor will be the answer !

Good luck !

A fixYa rating would be much appreciated Please !

John .

Feb 08, 2009 | 2003 Jaguar X-Type

1 Answer

2001 Jag S-Type stalls at idle


whats the fuel pressur like last time the fuel filter was changed and is there flow at the ehasut

Feb 06, 2009 | 2001 Jaguar S-Type

Not finding what you are looking for?
2003 Jaguar S-Type Logo

Related Topics:

130 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jaguar Experts

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Raygin
Raygin

Level 2 Expert

322 Answers

yadayada
yadayada

Level 3 Expert

61249 Answers

Are you a Jaguar Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...