Re: [xj-s] Alternator lights, what do they mean?

[Jim Isbell <jisbelljr@mail.utexas.edu>]

At 10:35 AM 7/6/98 -0700, you wrote:
>I'd investigate the voltage regulator, then the gauge.

The regulator on an 85 XJS is internal in the alternator.

The guage moves quite normaly.  I comes off the bottom stop and rises to
exactly 12.4 volts, the voltage to be expected when no charging is taking
place.

>I think the idiot light comes on when the voltage is seriously low, so your
>alternator should be outputting voltage, just not so low as to indicate
>total failure.

Usualy the indicator light indicates wheather or not the field is being
excited (enough current) and it is indicating the the field is being
excited.  So the conclusion might be that the diodes must be bad.  

Does anyone know how hard it is to replace the diodes or is it just much
easier to swap out the alternator?

>I'm trying to remember the alternator diagram - there IS a separate
>regulattor component on the Jaguar, isn't there?  If not, you may end up in
>the unenviable position of testing the alternator directly (remember how
>EASY it is to get to it?) and possibly replacing it.

Yes, I remember doing it on the XJ6  but in looking at the XJS it looks as
though it might come out from the top if I remove the air pump.

Anyone know?
                                    Cheers,  Jim


"Better an outlaw than not free."  Nance Oneil

Low Tech Web page          http://www.angelfire.com/tx/MillenniumFalcon
 (need only web access, no pictures to download)
Medium Tech Web page       http://members.spree.com/Millennium
 (Need at least VGA and 28K modem or else its very slow)
High Tech Web Page         http://members.tripod.com/~Jim_Isbell
 (Should have fast modem, fast computer,SVGA, sound capability...etc.)

---

Follow-Ups:

• Re: [xj-s] Alternator lights, what do they mean?
• From: mfl@kernel.paris.sgi.com (Matthias Fouquet-Lapar)

References:

• [xj-s] Alternator lights, what do they mean?
• From: Jim Isbell <jisbelljr@mail.utexas.edu>
• Re: [xj-s] Alternator lights, what do they mean?
• From: sean.straw+Jaguar@mail.professional.org (Sean Straw)

---

• Prev by Date: [xj-s] Header Tank
• Next by Date: Re: [xj-s] Alternator lights, what do they mean?
• Prev by thread: Re: [xj-s] Alternator lights, what do they mean?
• Next by thread: Re: [xj-s] Alternator lights, what do they mean?
• Index(es):
  • Main
  • Thread