[urq] quattro wiring project

[Patrick Carlier]

I see , just like me , you have the joy of an early style fusebox .
Talk about crappy engiuneering .

I'de say , clean up , re-wire and relay the fuel pump circuit .
There are two or 3 useless splices and connections in that circuit  all 
located near
the fuse box . I gained at least 3 Volt at the fuel pump terminals , without 
relaying .
Later on I did install the relay .

Pat

Oh btw if you need the early fusebox  schematics , I  have them scanned in 
colour .




----- Original Message ----- 
From: "Thatcher Hubbard" <thatcher.hubbard at gmail.com>
To: "Urq List" <urq at audifans.com>
Sent: Saturday, June 09, 2012 3:15 AM
Subject: [urq] quattro wiring project


> In getting my car running again, I had to dig pretty deeply into the
> wiring.  Like most of us, I've had a variety of wiring-related issues over
> the years, and since I was getting tired of half of my electrical
> accessories not working at any given time, I decided to try to start 
> trying
> to reverse engineer all of the circuit paths and get a better 
> understanding
> of how the whole system works.
>
> I've actually been taking pictures and trying to put some notes together 
> so
> I can share what I do learn with the list.
>
> One of the first things I've done, mostly because it was dead easy, was to
> move the radiator fan fuse out of the fuse box.  It has been suggested to
> the list before that this might be a good way to lessen the fuse boxes
> apparent desire to self-immolate.  I have an e-mail from Tony Lum way back
> in 2001 that was the first I saw of it.
>
> His suggestion was to simply wire in an inline fuse holder, which I'm sure
> beats doing nothing, but there's a couple of things that seem less than
> ideal about that to me.  First off, it would probably means carrying 25A
> ATC fuses as well as the 8A, 16A and 25A bus fuses the car already uses,
> which really isn't a big deal.  Also, if you were to use a pre-wired
> holder, it would mean a couple of butt splices in the rat's nest of wiring
> behind the fuse box, which I'd have a hard time trusting and would also be
> easy to lose or forget about.
>
> I came up with an alternative I wanted to socialize and get some opinions
> on, and possibly put in my nascent quattro wiring bible.  I've got a 
> couple
> of pictures to go explain what I did.
>
> On my car at least, there are four additional fuse holders that snap in
> above the main fuse box.  This was always a land of mystery to me in the
> past, but I think I've actually figured out most of what's going on there
> now.
>
> The top right auxiliary fuse holder on my car only has a single fuse wired
> into it, a 16A that fuses the seat heaters.  Since these holders just have
> spade terminals on them just like the fan circuit uses, I pulled G1 and G6
> (red/black and red/blue respectively) off the back of the 'G' terminals on
> the fuse box and put them on the fuse holder terminals, then put the 25A
> fuse that was in slot 15 of the fuse box in there.  I tested the basic 
> path
> by jumpering my low-speed circuit at the radiator fan switch, and it 
> works.
>
> I figure that at the very least, it's probably easier and cheaper to
> replace the auxiliary fuse holder than it would be the fuse box, and it at
> least uses the same fuse type and keeps it accessible.
>
> I wanted to see what the list thought of this change and if anybody had 
> any
> considerations or problems I hadn't thought of.
>
> Here's a link to a before photo:
>
> http://tropicalboondoggle.smugmug.com/Cars/quattro-wiring/i-BjzsJgf/0/M/DSC2241-M.jpg
>
> And here's an after:
>
> http://tropicalboondoggle.smugmug.com/Cars/quattro-wiring/i-HTwrJVg/0/M/DSC2242-M.jpg
>
> I'll share some of my other notes here as I clean them up and put the
> photos together.
>
> Thatcher
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