75 duster slant six weak spark

I decided to dive into the bulkhead connector. Mine had this tar lookin crap on top of the connectors in the engine bay which I had to scrape off so the connectors would come out. Minor PITA but I got them off. I found all connections were bright shiny brass, looks like the tar protected it over the years.

However, there was a thick black wire with a red tracer that someone had added a length of fusible link wire to (going into the connector). I'm not sure what this is but I'm assuming its one half of the ammeter/power circuit into the car. It appears someone had a corrosion/bad connection on this some years back so added 14 gauge fusible link to it. I need to get a replacement packard connector so I'm not able to test anything right now.

I can't imagine this fusible link would hurt anything right? I have plans to do the ammeter bypass soon, so perhaps I should just get rid of that fusible link (its not factory appearing, I.E. there are no big square plastic tabs that say "FUSIBLE LINK")????

Forgot to mention, its a 5 pin ECU, there are no mopar stampings on it. It has both sides of the ballast resistor in place.
I have sanded the body where the ECU mounts on drivers side inner fender, it should be getting a good ground but I haven't tested with a meter.