Help me fix my van on 1994 Dodge Ram Van B250

My back up light still does not operate even though , I change the bulbs and the fuses.what should i do.

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4 answers
back up light switch on side of trans
Also check harness for bad connections and broken or damaged wires. If it's a work van it's possible there's harness damage near the back. also you can test the switch and power source to it before replacing it.
neutral starting switch?
It may be a bad backup lamp switch - pretty common on these vehicles.