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If you think there is a problem with instrument cluster, unplug the instrument cluster, see if it still blows the fuse. Could be a wiring circuit problem, somewhere? Maybe fuse box issue?
Sometimes, I use a test light in place of the fuse, to keep from blowing all my fuses. If the test light comes on, the circuit is going to ground, somewhere. If the instrument cluster is unplugged, then hopefully, that is ruled out.
You have a direct short to ground on that power feed circuit . You need to find a power distribution diagram to see what all gets is power from that fuse . Isolate the circuits till the fuse doesn't blow any more , then trace out that circuit that blows the fuse .
Which Ignition fuse ? Which fuse box is it in ? under hood , passenger compartment ?
IGN A
40A
Ignition Switch RUN, START, RUN/START/ACCY
IGN B
40A
Ignition Switch RUN/ACC, RUN/START
Could be ignition switch problem , Chevy has had problems with them .
you got a grounded wire. check the wiring in the back of the radio if its custom radio i can almost gaurentee thats what it is. however electrical aint my best area. lemme know if i helpd any.
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