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Handy plug with extra wire to save ...damn Im a horder lol . There may be a fuse in cig base to protect light gauge wiring but OEM fan supply is likely be fused at 5ish amps for the fan wiring your replacing.
Besides saving the cig plug as a horder you could create a power supply and known ground for testing interior 12v systems. You can loose a lot of time chasing a problem when you loose a ground in a daisy chain.