Circuit Diagram for '83 Quattro Coupe

[ben swann]

Huw,

I am definately considering swapping the dash and console out for those
from 87 4kq.

The wiring swap would be good too and I have fuseboxes and harnesses
from '87 4kq.  My reservation is that in order to swap the older style
bullit connectors into the newer fusebox would require refitting all
the wires to the new connector types.  This may be far more work than
necessary.  Alternatively the whole car could be torn apart to install
all newer harnesses - a lot of work, perhaps unnecessarily.

Right now I'm sorting out the spaghetti - once wires are uncrossed,
things are easier to trace.  It appears those who visited this wiring
before were not very neat - important to me, especially when you are
troubleshooting.

As others pointed out to me earlier, the wiring does seem to conform to
the Bentley diagram for the '84 quattro, which was hard to trace at
first.  It took awhile to sink in that the fuel pump relay control uses
a basic relay which is triggered/controlled by the Engine control unit,
rather than a standard fuel pump relay triggered by the ignition.  I
still may have a problem with that, but have narrowed it down
considerably.  Never did find a fuse.

It would be good to have a fusebox diagram similar to the one on your
site that shows the older style.  That might help with a migration of
sorts.  If I do any radical harness & fusebox update, it will be when I
install the harness for the MC-1 engine.

I am going to relay the pump near the battery.  I have found on these
earlier harnesses in my dealings with the Rabbits and Sciroccos of the
same timeframe with very similar wiring, that the key to preventing
meltdown is to properly fuse and relay the major power consumers like
Ignition, fuel pump, fan, etc.  Right now I see no reason to dig up a
can of worms by tearing the car apart and installing updated
harnesses.  That may be the thing to do for the future given a lot of
time.

I think I can have some fun with the stock engine for awhile and
concentrate on making the car shine cosmetically before doing more
radical performance enhancements.  The car is straight and a great
start for making something beautiful and fun.

Ben
'85 4000 quattro x 2 - are/will be for sale
'87 4000 quattro - "project GTQ" slated for NG install
'88 5ktq avant(soon) to replace '87 5ktqa
'86? Quantum syncro(soon)
'89 80 - going going go..
'91 200 20V tqa

----- Original Message -----
From: Huw Powell <audi at humanspeakers.com>
Date: Monday, June 16, 2003 11:58 pm
Subject: Re: Circuit Diagram for '83 Quattro Coupe

> I don't have a Bently for this car yet.  Does anyone have a scan, or
> link to the circuit diagram of '83 Ur Quattro.  My manuals only go
back> to 1984 with their diagrams.
>
> A similar one from pre-84 4000 may do too.  I am trying to identify
> power to the fuel pump, CIS etc.

Ben, and anyone else cares,

If I had an Urq (and I don't...) with an underdash "fusebox" before I
wasted any more energy sorting out the car I would buy a used '87 coupe
GT from my friendly used car supplier (Chris Semple).  It would be a
great source for random spares, of course, but there would be two
things I would shift over to the Ury - one, the pretty dashboard and
console (although a 4kq console fits better)


two, the fusebox.  I'd cut the UrQ where it goes and weld in the metal
from the Coupe.  Also I would swap over as much wiring for the cgt as I
could.  The connections are a lot better by 1987, some harnesses could
just go in whole (rear light, instrument cluster, power locks, power
windows, eg) and some would get spliced a bit (engine management
sources eg).

I have one of those underdash "fuseboxes" in my 82 coupe, and they are
pathetic.  I have done about 4 or 5 bypass jobs on it so far, the silly
things melt and die a slow and painful death just trying to run the car.

On my site there is a diagram of the entire internal wiring of the
underhood fusebox, with that and a Bentley or two you would have all
kinds of fun doing this job.  And then you would know the wiring in
your car intimately and it would cause no more trouble...

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/]