CDA 455 II
ANFAQUE2

Can I direct-wire an up/down switch for the rear window of my '94 Bronco; bypassing the existing wiring?
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Whatever you do don't put a fuse inline. They can fail, leaving the window inoperative.
You must have 1 of these in any circuit!
fuseable link
fuse
circuit breaker
Each needs to be rated at the amperage of the device it protects.
or you could just let er burn down...