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

[calvinlc at earthlink.net]

Jim,

This is EXACTLY what my thought was a couple of weeks ago when you first
posted and I replied that it was most likely a ground connection problem.
All you have to do is ohm out the connections from the tach to where they
leave the circuit board...that way you don't have to re-solder for
re-soldering's sake.



-----Original Message-----
From: s-car-list-bounces+calvinlc=earthlink.net at audifans.com
[mailto:s-car-list-bounces+calvinlc=earthlink.net at audifans.com]On Behalf
Of Mark Strangways
Sent: Saturday, December 17, 2005 7:51 AM
To: Kent McLean; AUDIJIM at aol.com
Cc: s-car-list at audifans.com; quattro at audifans.com
Subject: Re: [s-cars] Re: inop tachometer/need new tach?


Sounds typical of a bad ground weld.
Audi (VW) like to make theses nice welded ground connections all over the
place.

I have traced the ground path from the tach, it does ground the brake
warning light, and leaves the IC thru connector T26a ( 26 PIN GREEN) pin
number 11.
The ground then goes to ground connection 81 which is in instrument panel
wiring harness.
Try to bring a NEW solid ground point to the IC connection T26a (green) just
before the connector. Splice it in or use a needle to pierce the wire
insulation, then ground that well. If you problem goes away, then look at
that ground connection to see where it breaks. I would not just re-ground
that point, as you could eventually leave other stuff ungrounded later.

Mark S

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