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I had a similar problem with a different vehicle, 1968 LeMans. Complete and total loss of 12 volt power to the fuse block. I traced the cause to a loose wire on the ignition switch. I don’t know if the wiring from the battery to the fuse block is the same on a Jimmy but it’s something to consider. I’d suggest finding a wiring diagram and trace the electrical path to check all connections. If it happened once it will likely happen again.
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