On 9/24/2019 4:45 PM, amdx wrote:
On 9/24/2019 9:50 AM, Terry Coombs wrote:
On 9/24/2019 9:03 AM, Joseph Gwinn wrote:
On Sep 24, 2019, Terry Coombs wrote
(in article ):

When I got my truck back from our son , lots of things that he just
couldn't be bothered to fix . One thing is the radio power supply . He
did tell me that the radio had "died" , turns out the fuse (in the
fuse
block) keeps blowing . I've got the dashboard apart enough to check
the
wiring harness and supply wires , can't find any cuts or anything that
looks like damaged insulation ... it works just fine sittin' in the
driveway , but within a few miles driving it blows the fuse . I
figured
it was the radio/CD player unit so I got a new one , does the same
thing
. I'm really puzzled by this , from the way the fuse was spattered
it's
got to be a dead short to ground . I think it very unlikely that
the new
radio/CD unit is bad - the old one did work when I replaced the fuse ,
for a few miles same as the new unit . This is an '86 GMC pickup , I'm
hoping someone here might be aware of a known problem area that I
might
check ... I gotta have tunes !
It´s classic for sure. The power wire is bouncing around as you
drive, and
over time the wire insulation was worn through, allowing contact
between
copper wire and some part of the steel body.When you find the spot,
it will
be pretty obvious visually.

Solution is to find out where this is happening, and mechanically
prevent
further contact.

Joe Gwinn


Â*Â* I kinda figure you're right , there's a place where it's worn thru
. The problem is finding that spot ... if it was obvious I'd have
found it by now . I've looked and felt as much of that harness as is
available to check , nothing so far . I'm starting to wonder if it's
in/near the fuse block , maybe where the under-dash wiring comes from
behind the block . But it's raining today , and I'll be too busy to
look into it further until Friday or Saturday .


Â*If you know where it comes out of the fuse block. cut it at about 8",
connect a new wire, run that up to the radio and do the same at the
other end. Give yourself 8" out of the radio connector and connect
your new wire.
Â*Also, I would have taken the connector loose from the radio and drove
it before I got a new radio, just to verify, harness or radio.
Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Â* Mikek

Â* I wanted a new radio anyway ... that one was a freebie , the
back-light on the faceplate died some time ago and it has no aux inputs
.. As I mentioned here somewhere , I'll be looking into doing what you
suggest on Friday . Tied up until then .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !