[s-cars] inop tachometer/need new tach?

[Bjorn Eirik Odegard]

Grounding. Check the common grounds at the a-pillar base and by the
distribution 'central' under the IC.

Bjorn  :o)
'92 S4 MTM

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of AUDIJIM at aol.com
Sent: 17. desember 2005 03:52
To: s-car-list at audifans.com; Audi5TurboTech at yahoogroups.com;
quattro at audifans.com
Subject: [s-cars] inop tachometer/need new tach?


I made some great observations yesterday. After I re-soldered every contact
on the instrument cluster (IC) boards, the Tach was again inop. But it was
actually working correctly for two or three days until yesterday. Why? I
don't
know. I found that if I pull the hand brake (emergency brake) and the
"Brake"
light indication illuminates on the cluster, the Tach works. If I release
the
hand brake, the Tach stops working. I usually do not use my hand brake, but
I did
this time. All I have to do is trip the hand brake switch, the light comes
on, and the Tach starts working. Today after work, I got in my car, took it
out
of gear, started it in neutral and my foot on the brake and the low oil
pressure graphic came on and the Tach stopped working. As soon as I pulled
the hand
brake, the low oil graphic went away and the Tach came back to life. So I'm
getting somewhere! So I have a hard case for my sunglasses that when
positioned
under the hand brake lever, it just lifts the lever up enough to trip the
switch and the brake warning light comes on, but not enough to drag the
parking
brake on the rear calipers. I'll play with this in the wiring diagram
tomorrow.

Jim
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