My buddy has a '94 Astro, 4.3L. He's been popping his 20A gauge fuse like
they're Tic-tacs. We've tried disconnecting the turn signal/cruise harness
under the column (I read that might be the same curcuit) and it still pops
fuses soon after switching to the run position, even without starting the
engine. Before the fuse pops the speedo goes crazy and we even managed to
blow a fusible link at one point, since replaced.
Checking for codes is useless as the CES light goes out with the gauge fuse.
Besides, I doubt it'll tell us much of anything.
I'm thinking that we need to pull the gauge cluster and check for bad wiring
or a bad ground, or possibly replace the cluster entirely. Is there anything
else on that circuit that could cause our problems? Any other suggestions?