Throwing new parts at a problem until it gets fixed can get expensive. There are less expensive ways to troubleshoot.

For example: turning the contact within the switch 180° may solve the problem. Of course, checking for a sloppy linkage would be the first order of business.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.