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Just unplug the switch. Wrap some electrical tape around it to prevent it from shorting out or anything and tuck it away from the switch. The only thing this will do is prevent the cruise from working.
If you pull the fuse for the cruise control, several other systems will be affected as well.
You will not need the new fused wiring harness, as the new design switch likely won't ever leak, and if it does it's designed not to short out the electrical contacts.
I changed the cruise control switch on the master cylinder on my 2002 Mazda, with a new metal one from Ford. It came with a short jumper lead that plugs into the new switch and the truck wiring. It was about $14.00 for the kit. All you need to do is unplug the connector on the Master cylinder to kill the cruise, and not worry about a fire.
You can purchase it from any ford dealer, but it may cost a few bucks more. I don't know about Rockauto, but the kit Ford sells includes the new design switch and a non-fused wiring harness to adapt the old plug into the new plug of the new sensor.
Caseys, being that fluid has already gotten into the harness connector, I HIGHLY recommend that instead of just plugging in the new harness, you cut the connectors off both harnesses and solder the wires together.
The FUSED wiring harness is only to install on the old switch if it isn't leaking. That way if it shorts out the fuse will blow instead of burning down the truck. When ford issued this recall, they didn't care about the switches leaking, they just cared about the fire hazard.