On Tue, 24 Sep 2019 11:15:34 -0500, Terry Coombs
wrote:
On 9/24/2019 10:07 AM, Jim Wilkins wrote:
"Terry Coombs" wrote in message
...
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 !
Itīs 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
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 .
--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !
Taping possible contact areas may help.
This has been useful when there are no voltage-sensitive components at
risk, like older appliances:
https://www.amazon.com/dp/B00975X2FY..._26725410_item
Battery-powered ones are more convenient, but don't stop generating if
you get shocked.
* And at a thousand volts ... someone else on another ng posted a link
to wiring diagrams , which led my eventually to a forum post that
indicates that power lead goes straight and only to the radio . It comes
out of the harness with the correct other wires . I have traced that
harness from the fuse block to the radio and find no damage or rubs or
torn wrap . My next step will be to pull the fuse block from the
firewall and check for problems on the back side . Gotta pull the plug
off from the rngine side first , and that ain't happenin' in the rain .
Just pull a new wire from the fuse block and be done with it.
Gunner
__
"Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is.
No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public.
Which is a very good thing."
Asun rauhassa, valmistaudun sotaan.
--
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