In addition to controlling your backup lights, it also prevents you from starting your truck when it is in gear. That is where the name comes from, neutral safety switch. There should be 2 heavy gauge purple wires that go to those terminals. And to answer your other question, yes, the part sould be easy to get at any parts store.
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1971 C-10 Suburban (Ochre)
1971 K-10 Suburban (Ochre)
1972 C-10 Suburban (Ochre)
1972 K-20 Suburban (Yellow- that just aint right!)
Springfield, Minnesota 56087
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