Oh yes the trouble area on many a Mopars, The main bulkhead connectors on the firewall of 60's to early 70's Mopars is held in place with
2 plastic clips 1 on either side, there are 3 of them in the main bulkhead connections, the top 1 is were the
drk. blue fuseable link is at far left side if I remember correctly, you
very carefully pry them outwards {the plastic hold down retaining clips}, it old plastic & will break very easily, while prying out on the clips, rock the connectors slightly it will aid to remove them, if rust or corrosion is set in {very common affair}, when you put the connectors back together
make sure all of the connections are clean, free of rust or oxidation, clean each connection with a small brass or stainless brush or pipe cleaner work also, then clean all connections with an
aerosol alcohol based electrical contact cleaner that evaporates in just a few minutes at the most, then it's very important apply a small dab of
dielectric grease to each individual connection be careful not to slop it every were... This is a very common area to have problems in 60's-70's Mopar electrical systems, everything goes thru those connectors, thru the Amp gauge...
Good luck, you could also hard wire in a 12 volt re-setable type breaker or a inline fuze in place of the stock fuze-able link... There is a great site that sells components & has great tech. fixes for that area worth looking at
www.MadElectrical.com ....