1971 dart Only cranks when I jump the relay.

Hey guys I daily drive a 1971 dart swinger. I’m having a weird issue with my car. Randomly the car didn’t want to crank after I parked it. when I turn the key to the run position the oil light still comes on, and when I twist the key to crank the light dims like it’s sending power out. My first thought was the nss, so I went to the relay and grounded the yellow nss wire terminal thinking I would just bypass it until I can fix it later, but no dice. Next I’m moving on to the relay itself; I don’t think it’s the issue, but it is the easiest thing to fix next in line. Any thoughts. I’m getting tired of jumping the relay every time I need to drive.