Electrical problems 2

Still working on the problems I have with the wiring of my Mustang. I have now replaced the turn signal flasher by a new original one, because I noticed that the one placed in my car was far from original and needed an extra ground (?).

I've also replaced the engine to firewall ground wire, as the old one did not look that great. So bit by bit I hope to solve all electrical problems and avoid the job of replacing all wiring harnesses...