There is no fuse for the fuel pump just a fuel pump relay.
NO!!
Alternator
You can get a 1990 Dodge Dakota fuse diagram in the owner's manual. You can also find it at select auto part stores.
Yes, there is a fuse panel diagram for a 1990 Dodge Dakota. It is found on the back of the panel cover and it can be found in the owners manual.
It is the same fuse that feeds the PCM. So if the truck runs and the alternator works it is not a fuse.
In the user manual
When you pop the pannel off to access the Fuses there will be a sticker on that pannel with what fuse goes where and how many Amps that fuse needs to be.
It is located on the fuse box next to the headlight relay.
I can tell you that on a 2000 mercury cougar it is a fuse on the positive cable between the battery and the alternator
No, there is not a fuse on the alternator.
Some 1990s had a fusible link. I am not aware of any with a fuse. The fusible link is between the alternator and the battery, connected with heavy wire. Kind of easy to miss. http://www.marksatterfield.com