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Ralph Mowery

In article , says...

* So 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 !

Can you just run a wire from another place through a fuse to the radio
? That would tell if it is the radio or the wiring. I am sure you
checked, but is the fuse the correct value and not just one that someone
in the past has changed for the wrong value.