[urq] '83 Wiring diagram errors in Bentley

[Robert Pastore]

steve:
Agree on E2 not F2 as location that 15 enters fusebox.  My typo.

The bright side is I've now got spark!  I jumped the fuel relay, the pump kicked on, and the braided steel fuel line to the Callaway Microfueler started spewing 17 year old gas like a lawn sprinkler!   I've got to drain and refill the tank, and replace the fuel line, but I am optimistic that she will fire up this weekend.
----t-Original Message-----

From:  Steve Eiche <seiche at shadetreesoftware.com>
Subj:  Re: [urq] '83 Wiring diagram errors in Bentley
Date:  Tue Aug 29, 2006 11:02 pm
Size:  3K
To:  rpastore at animalfeeds.com, urq at audifans.com



> ----------
> From: 	Steve Eiche[SMTP:SEICHE at SHADETREESOFTWARE.COM]
> Sent: 	Tuesday, August 29, 2006 11:04:09 PM
> To: 	rpastore at animalfeeds.com; urq at audifans.com
> Subject: 	Re: [urq] '83 Wiring diagram errors in Bentley
> Auto forwarded by a Rule
> 
Bob,
Welcome to the joys of the early ur quattro electrical system!

First off, I believe that the power from the switch enters the fusebox at E2, not F2.  Next, the coil and the ECU get 15 (ignition) power from different places on the fusebox, so if you are not getting power at either place, I would take an Ohm meter to the fusebox. There are no fuses in the path (bad) so it should be easy to test.  Those fuseboxes are notorious for breaking internally.  My Euro '81 and '82 wiring diagrams show 15 power coming out of the fusebox for the fuel pump (and later the ECU too) on terminal G3. It shows the new fusebox for '83.  Odd.  I don't think that a correct diagram exists for the pre '85 US cars.

If I could find my old fusebox I would trace it out for you, but it sure sounds like the the fusebox itself is bad.  

Steve

Bob wrote:

I've purchased an early build '83 (#129) with a build date of 2/82.

The good:   Car have low original miles, the body is all there and in good
shape, and there is no rust anywhere.

The bad:  Car hasn't run in 17 years, has the under dash fuse box, and the
harness under the dash looks like a bowl of spaghetti that was attacked with
a chain saw.


Eventually, the car will be a 20vt conversion, and I already have the CGT
harness ready for the project.   Bit I can't resist the urge to get the car
running before I begin the project.

I've got no voltage on terminal 15 (switched +12V) at the coil, at pin 14 of
the ecu, or at the fuel pump relay.  I've changed the ignition switch and
repaired the harness from the switch to the fuse box.  The #15 black wire
has voltage going into the fuse box, and the terminal (F2) where the wire
from the ignition switch doesn't look burnt or damaged. (I'm almost
convinced the fuse box is bad internally)

Bentley ('84 diagram, said to be good for '83) shows a black wire from
terminal A11 of the fuse box that runs to pin 14 of the ECU.   The wire in
A11 is not black, but light gauge blue/red, that seems to be for backup
lights, and has nothing to do with ignition.  Steve Eiche was kind enough to
confirm that his spare '83 harness also has blue/red, and not black, in A11.

With Steve's help, I've traced the ECU pin 14 black wire to a strange white
plastic spade terminal "dongle" that multiplies the available pins for
terminal 15  (There is a similar dongle for B+ (terminal 30) to distribute
power too).  IF you look at Bentley, this might correspond to connector F2,
but it sure as hell aint a two-pin connector. These dongles have short leads
on one end that plug into the rear of fuse box spade terminals, and then
they have multiple spade terminals available at the other end.

The power circuit wiring for the ignition system is nothing at all like the
Bentley shows, and I was wondering if anyone had documented the differences,
or if a wiring diagram exists to show the reality.

rgds,
Bob