On Tue, 24 Sep 2019 07:58:47 -0500
Terry Coombs wrote:

Â*Â* 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 !


Just some random ideas... Does it have a power antenna? (doubtful)

Check the fuse schematic and see if anything else uses the same fuse?

Any kind of work/replacement done than might have pinched a wire
underneath or shot a new screw threw a wire?

Some speaker systems run "hot leads" and do not behave well
if a lead gets grounded...

--
Leon Fisk
Grand Rapids MI