Not normal. With the key in the "on/run" position you should have power to both sides of the fuse. Corrosion is usually the culprit if the fuses are good.

I use a brass bristled brush to clean the clip ends.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now