It's a 1995 Mark VIII. They flicker fairly fast at idle and faster with
acceleration. Everything else seems normal. The battery and alternator
are just a few months old. Someone told me it sounds like a ground
problem. I hope it's not the alternator even though it's under warranty
and I put it on. It didn't do this before the battery and alternator
and it didn't do it after. It started about a Week ago. Seems to run
perfect and smooth. Thanks for your help.
Maybe ground, but could still be alternator. The stock Mitsubishi 120A
alternators seem to be impossible to rebuild reliably. The best bet for
an alternator is a Ford/Motorcraft 2nd Generation one (Delco design)
made for a late '96 thru the '98 Mark VIII. Perfect fit, very reliable,
and 10 more amps capacity than the older model. Another reliable way to
go on the Mark VIII alternator is to buy an aftermarket NEW alternator
from a place like PA Performance or WAI. Another thing that can go bad
is the 3-wire IAR plug that plugs into the back of the alternator, about
$8 at any auto parts store. The electrical warning system on a Mark VIII
is not very good, and a $15 plug-in voltmeter (equus 3721) from Wal-Mart
will allow continuous monitoring of the charging system.
I will check all this out. For what it's worth the alternator is new
and not rebuilt.
It's from Autozone but I had the option of a rebuilt or a new one and
I got the new.
I realize it could still be bad.
I think I might know why the lights flicker but haven't checked.
A few years ago I replaced the turn signal control that also
operates the brights. I replaced it because my headlights
wouldn't work at all. It had a wiring harness that plugged in
the unit. At that time the plug on the harness looked as if it
had gotten hot. So if thats it I don't think it will be easy
to replace that plug with so many wires in it.
The alternator and battery tested good.
firstname.lastname@example.org wrote: ( 1995 Mark VIII )
Headlamps and interior lamps flicker fairly fast at idle
and faster with acceleration. The battery and
alternator are just a few months old, and they both
Check for a failing voltage regulator.
Sometimes flickering is caused by poor brush/slip ring
contact in an alternator, but yours tested okay.
I did a lot today without success. I removed all the chassis grounds I
could find and sanded the chassis to a shiny metal and sanded the
terminal ends and put them back on tight. I found chassis grounds for
the negative battery cable, the one at the starter, I found two that
were tied into the lighting under the hood. When I turn my headlights
on my interior lights and all the
dash lights drastically dim. I'm still wondering about a faulty
battery. In June when I put on the new alternator I ran the battery all
the way down. My friend charged my battery before we started the car
with the new alternator. At that time in June he could charge my
battery up as high as it should have been. The battery still works but
it might be crippled. I appreciate everything you all are suggesting
and I will try everything. Probably not much more you all can do. Thanks
On 10 Nov 2006 12:02:08 -0800, email@example.com wrote:
I would strongly suspect you have a bad battery connection, but in
order to find out for sure what your problem is you need a voltmeter
and you need to understand how to perform voltage drop tests on bothe
the power and ground sides of the circuit. That is the ONLY way to pin
it down accurately - as well as the simplest.
Posted via a free Usenet account from http://www.teranews.com
you first step is to clean the battery cables and tighten all the
grounds you can find under the hood. Also check your connections at the
alt. My guess would be a bad alt. Look for pulsing voltage on the bench
when you take it back. If you can see the lights pulse you should be
able to see the voltmeter on the tester pulse.....but not necessarily
:)Either way talk them into replacing it. (only way you will know for sure.)
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