You replaced the starter RELAY on the fender, right?
(starter Solenoid is on the starter motor)
Battery "+" cable goes to that Relay, larger post, and ALL the other wires go to that same larger post, that's the Power distribution, it feeds the Engine fuse box, which feeds all the other systems.
One EXCEPTION.........the starter motor cable, it goes on the other larger post on the Relay and to the starter motors solenoid.
And there will be a smaller wire that goes to the smaller "S" post on the Relay, this wire activates the Relay when key is turned to START.
If you miswired the Relay then there would be no power anywhere, Battery "+" must be connected to the Fuse box, that is done via the Starter Relay's post, alternator is also connected to that same post.
Starter Relay should have multiple wires on one larger post, including Battery "+", and a single wire on the other larger post.
1994 was a transition year when Ford was moving starter relay to the starter motor, but all the wiring was still setup for fender mounted starter relay, so it is still needed for power distribution.
So you may have larger battery "+" cable going directly to starter motor from the battery, then slightly smaller wire going from Battery "+" to fender mounted relay, same setup, power distribution
12.8volts means battery is OK