98 windstar keeps dying

You talking ecm bat fuse 20 amp? Voltage to that fuse is hot all the time. It comes from fusible link. Make sure battery has a full charge and connections all good. Then check fusible links, one way to check fusible links, use a test light and check voltage on both sides. I usually follow battery + circuits to find fusible links.

John, IOD fuse,Fusible link is probably bad, maybe grab one at wreckers.
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Check the batter voltage first. If not that check fuse panel under hood for a 100 amp fuse check to see if the fuse is bad or if it has power. Also check fuseable link wire at starter to see if wire is still good. If it is bad, internal short possible on starter, take out and test it. Replace fusible link.

a lot of times its a fusible link not a fuse. but sometimes its the main 100 amp fuse on fuse panel under hood.

to check to see if your fusable links are shot, grab one by the cylinder, then gently tug at each wire at each end, if it comes right out or elongates, its toast, replace.

The alternator is not charging, even if it's new, you probably have a fuse that is blown. Look in the fuse panel under the hood where the big fusible link style fuses are held. I think you'll find that one of the larger fuses in this panel is bad. They are hard to see sometimes, a multimeter may be needed to check them.

check altenator connections,is belt slipping? check your fuses also the ones under hood in black box

Check the wire from the altenator to the battery. The large wire on the back of your altenator may have a fusible link in it. Check this wire with a multimeter set on continuity or resistance. If the ohms read low the wire is fine, if the ohms read high or infinite the wire/fuse link may be bad. There is also a main fuse in the box under hood to check>

you have to check all fuses with a test light both fuse boxes under hood and under dash... if good next to look for is the light switch itself... has any radio work been done to the lately... if so alot of times hooked up wrong will blow park fuse as one of the wires to radio is the park voltage to tell radio to dim down some

your fuse box is inside , lower left kick panel , check all fuses in there , then also in the engine compartment on the firewall around the middle is a junction block with like 2 fusible links , they need to be tested , and also 1 fusible link right off the positive side of the battery , test it also , if you don't have a test light for testing , you can kinda wiggle the fusible links and feel if they are limp and stretchy , that's not a good sign , you can buy replacement fusible links or fusible link wire from local parts store , depending on how much sparking happened you may have blown the fusible links . if you don't have a test light , pick one up at the parts house and learn to use it , it will be invaluable when it comes to testing this kinda of failure . cheers .