We've checked the inertia switch and there is no power. Then we checked the fuel pump relay and had 12volts, now I'm thinking it's the fuse link, but I have know idea what that looks like, or even what it is. Please help
The fuse links are short lengths of special wire on the starter solenoid, they look like regular wire for the most part, but the gauge is a little smaller than the circuit they protect. They'll usually burn up, so its pretty obvious if they're bad.
You didnt note what you jumped at the relay to make the pump work. Depending upon the year of your car/harness, the inertia switch is either on the control or load side of the circuit.
On earlier models, the link for the load side is 18 gauge, connected to an orange/lt blue wire.
Simply stated, if you have one terminal at the FP relay with constant power and another that shows key-on power, the links should be ok for the circuit.
No info about your car's model year, EFI or carb, no mods listed. Makes it hard to troubleshoot when we don't know what you have.
Therefore, no clue as to which wiring diagram you need. The wiring changed several times between 79 & 95.
That's why it is a good idea to use the sig under the user control panel (User CP) option. It allows you to post your car year & mods, which help greatly when troubleshooting things. No, it is not there for us to snoop and see any "Secrets" you have hidden away under the hood. Be a good stangnetter and update you sig for future reference & don't keep us guessing.