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Yes there should be an in-line fuse. If there is not an in-line fuse and there is a voltage spike in the vehicle the fuse will pop and disable the circuit where as if there was no fuse the accessory or mechanism could be destroyed.

As above suggests, the fuse must be put in series. If it is in parallel, the fuse should blow immediately on completing the circuit, because it is effectively a short, which will cause large current flow into the fuse until it blows. Never, never, never put a fuse in parallel with whatever you want to protect - that defeats the point of the fuse.

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