The little boxes by fusible link in a 1985 dodge power wagon by firewall are voltage regulators.
my 1990 the fusible link is in behind the battery on the drivers side. nice place for corrosion
yes
the fusible links are next to the Battery you will have to take apart the wire harness cover then you will see them
Pop the fusible link?
Check near the battery.
Over current or short to ground.
The circuit is shorted to ground.
If you are getting power to your coil and you still have no spark at the spark plug, you have a bad coil. Beyond that you will have to chase the electrical system. could be a fusible link.
If the fusible link itself comes apart, it's faulty and needs replacing, preferably with a new fusible link of the same size. Fusible links are a kind of permanent fuse, so it needs to be there and it needs to be the right one. If a new one cannot be obtained from an auto parts store, a Dodge dealer should have it. Install the new one as per its directions.
What ever circuit that fusible link protected would be dead if the fusible link is blown.
Try checking for a bad fusible link on wires leading away from the positive battery terminal.