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

huge snip
This is an '86 GMC pickup

Went and found a manual for same or similar online (64mb):

http://www.73-87chevytrucks.com/tech...ice_Manual.pdf

It seems that the fuse for the radio may also do a few other things:

Idle Stop Solenoid, Aux. Battery, Radio, Time Delay Relay, Emission
Control Solenoid, Transmission Downshift (M40) ..... 15 amp

This is from page 1331 in the manual mentioned above. Maybe it will
make more sense to Snag...

--
Leon Fisk
Grand Rapids MI