Re: 89 200TQ Fuse Blown

[DeWitt Harrison <de@aztek-eng.com>]

On Wed, 16 Jun 1999 16:43:44 -0700, Pat Korach wrote:
From: tm2@earthlink.net
Subject: 89 200TQ Fuse Blown
>[ ... ]
>When I replaced the fuse it blows as soon as I put it in.  The fuse
>is the No. 4 fuse which shows that it controls the dash lights,
>trunk light, footwell lights and the AC control unit. 

Sounds like as nice hard short. It shouldn't be too hard to find.
Does the fuse blow as soon as the ignition switch is switched
on? Can you manage to switch the AC control to Off or does
the fuse blow too quickly? If you have an accurate volt/ohm
meter, measure resistance from load side of fuse to ground
with the fuse out. (The load side is the one with no voltage
when the fuse is pulled.) It will probably be less than 3 ohms.
Thn start disconnecting stuff from the circuit and look for the
short to go away.

>Another funny thing is that before the fuse blow the A/C control
>head would not  show a outside temp of more than 58 degrees F. 
>I assumed this is the reason the A/C  would not come on and
>now it shows the correct temp but the A/C still does not work
>I am kind of thinking the A/C control unit may be the problem.  

Don't overlook the blower motor control unit. Also, the trunk
light wiring harness is always a good bet. The wire insulation frays
where it is routed through the trunk hinge structure.

DeWitt Harrison
Boulder, CO
88 5kcstq