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You can get them from a big rig truck parts store. They're not on every corner like Kragens or Pep Boys, but I'll bet you can find one fairly close in the yellow pages.
I used a three way switch on my last truck like this:
1. aux. back up lights
2. OFF
3. aux back up lights and back up beeper
It worked well because it was great to use the backups for trailer hitching at night without having to be in reverse. The beeper was great for busy jobsites without having it tied into the reverse circuit and operating everytime I reversed in a neighborhood or grocery store.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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