1970 Dart starting issues- key will not crank now

Johnny Mac said
Bad grounds will plague you to the end of time. Sounds like the steering column isn't grounded. There is a little wire with 2 star eyelets everyone let's fall off when they remove the colums. So check that.
Also a ground up on the radiator support by the horn. Check that. The terminal that is a 45 degree angle on the starter relay is the NSS terminal. Check that.
And bulkhead are Terrible on these cars. Yes you can inspect those too.
Good things to check. Even seen battery terminals loose over the years

I'm going to check all this stuff over tonight again. Here is a possibility.... There's two wires the connect to the starter. The small wire goes to the main lug on the starter relay and the larger wire goes to the positive post on the battery.... I spliced those both cause they were not long enough. I soldered them and shrink wrapped them. Could this be the issue? It's been in the back of my mind this whole time.