72 Dart Swinger Fuse Blowing (New to Older Cars)

My 1980 Volare blew that main link once on a roadtrip. I made a quick repair downstream, and still on the highway, I stole a length of wire out of the choke circuit, folded it in half and parralel-spliced it in. Worked like that for a week or two until I spliced a 30a ATO fuse in there. Its been good for years. -Sounds like you have a somewhat more serious problem.You definitely want to fix that.
-In 40 years of living in the Mopar world, I only ever had one VR go bad,and it was a nearly new Mopar Performance constant-voltage type. Ive been running one out of my spare parts stuff ever since .Mine went to 20plus volts.
-As to your problem,you might check the back-up lite circuit.