While my '67 S1 FHC is out having new brakes installed, I have been driving
the '74 XJ12L–which I am sure shares many of the same components and,
therefore, problems with the powerplant in the SIII E-Jags.
I have a problem with the charging system, or else the starter is going.
When I drive the car for a short time (10 minutes or so) I can turn the car
off and the re-start it. When I drive it for a longer time, say 20 - 30
minutes, which gets the car good and hot (never overheats per the gage) and
then turn off the car, I can’t restart it without a jump.
I just replaced the battery, and it did not solve the problem.
My thoughts are either: A) the alternator is not charging the battery
sufficiently to allow it the charge necessary to re-start the car, or B) the
starter is getting a bit “weak” and when hot things are expanded and it
can’t turn over without a bit of extra voltage from a jump.
When the car has been driven 20 minutes and is good and hot, and I have the
AC on, the radio on, and the lights on, at idle the output of the alternator
is 12.78 V, 30 Amps, Diodes Good. (readings per the battery shops fancy
electronic testor). At 2200 RPM, everything on, Hot car, the output rises
to 13.6 V, 30 Amps, Diodes good.
Anyone out there that might have had this same experience or have an idea of
which component I next tackle?
Thanks,
Tom H.
'67 E, '74 XJ12______________________________________________________
Search the archives & forums - http://search.jag-lovers.org/
Subscription changes - http://www.jag-lovers.com/cgi-bin/majordomo
Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php