1975 Duster Potential Wiring Harness Issue

My 1975 Base Duster has had some electrical issues lately that can all be traced to the number 2 fuse on the fuse block. My turn signals don't work, radio doesn't work, windshield wipers don't work. Occasionally they will all start working for a minute or two then go out again.

First thing I did was get some new fuses and replace the number 2 fuse which didn't work, so I swapped it with other fuses to make sure it wasn't a fuse issue. Then I checked the connections on the back of the fuse box to make sure they were good, which they seemed to be.

I'm no expert, and my troubleshooting capabilities have about run out so I've come here for help. I'm really hoping it isn't an issue with a bad ground on the wiring harness because this is my daily driver and I really don't want to tear the dashboard apart.

If you guys have any suggestions, please let me know.

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