Electricals Again (Radio)

[mkb]

>>>>>>>>>>>>>>
Date: Tue, 19 Oct 2010 12:20:11 -0400

From: Grant Lenahan <glenahan at vfemail.net>
Subject: Re: Electricals Again (Radio)
To: quattro at audifans.com
Message-ID: <4CBDC53B.1080608 at vfemail.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

  You appear to be measuring from 12V to a capacitor. Ignore it.

Grant

On 10/19/2010 11:50 AM, mkb wrote:
> I'm not completely sure I understand where you are measuring voltage, but if
> the red wire with +12.5v is on one side of the fuse, and the red/blue
> wire with 1.6v
> and dropping is on the other side of the fuse, your problem is almost
> certainly a
> bad fuse.  Likely it conducts some electricity until it heats up, at
> which point its
> resistance increases causing the drop in voltage.
> - Ales
> <<<<<<<<<<<<<
>
> Hi Ales,
>
> I'm actually measuring from the fuse panel.  What I did was, take the fuse 
out,
> measure from the fuse terminal to ground and I get 12.5v and no voltage drop.
> This is where the red wire goes in.
>
>
> I then measured from the other terminal to ground.  This is where the red/blue
> wire attaches.  I see a steady voltage drop here from about 1.6v to about
> 20-22mV in about 20 minutes.
>
>
> Putting the fuse back in seems to "energize" the circuit.  But what is strange
> is that if I leave the fuse in, come back in 20 minutes or so, pull the fuse 
>and
> check voltage from red/blue to ground I get about 20-22mV.  So I'm not sure
> what's going on here.
>
> Don't know if that makes sense?
>
> So, in order to get the radio working, I pretty much have to pull/push the 
fuse
> every time.
>
> --
> mohammed
> 99 a6 2.8q avant
> 97 a4 1.8tqa
>

Time for an update.  Can't believe last time I looked at this was a few months 
back.  Anyway, I decided to take another look yesterday.  I checked the wiring 
in the right A pillar which seemed to check out OK.  So I think I've now 
narrowed it down to somewhere from the back of the radio wiring harness down.

Anyway, whenever I decide to pull the radio and start snooping around I'll 
update again.  Thanks for all the replies.

I'm such a lazy fook!

--
mohammed
99 a6 2.8q avant
97 a4 1.8tqa