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Re: radio fuse blows when you engage the 4x4 dash switch...
It sounds like the motor that engages the 4 wheel drive on the transfer case is shorted, this is not un-common, have the motor and the wiring to the motor tested, it may also have rubbed through on the frame where it routes to the transfer case.
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had the same problem on my 92 Blazer. my fix was to replace the 4x4 switch on the front axle. I don't remember exactly where it is located but I think it is on top of the axle. if it gets submerged in water it can get water in it and short out causing a fuse to blow. I remember it was pretty easy to get at and change.
Check the fuse to the 4x4, if the fuse is good then check the 4x4
electric motor actuator on the transfer case. You should hear it work
from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if
you don't hear it working then check the wire harness at the actuator
motor, look for any damages like corrosion or cracked wire connector
clips. If the 4x4 actuator is working on the transfer case, then the
front hub 4x4 actuator may have gone bad and that's located on the
front differential. It's common for the clip there to corrode and break
and is an easy fix with a new collar pin, at worst it's the diaphragm
on the vacuum actuator that is located under the battery tray. There is
a vacuum switch on the top of the transfer case, driver side but when
that fails, your front hub stay's locked in the on position. Good luck
and keep me posted and hope it's a simple fuse that has gone bad. You
can pick up all these parts at Auto Zone or Parts Source and they will
have the step by step instructions for you to get the job done with
jai un blazer 2001 avec un probleme de fuse qui saute seule du atc elle saute sur la route lorsque le 4x4 es engager apres quelque minute de route jai changer lencoder le module atc tout verifier le filage a l'oiel et jai rien trouver quelquun peu maidee svp