The can isent starting replaced the battery and terminals but still has no power and the main fuse is blown
SOURCE: 98 Ford Escort ZX2
If the battery was improperly polarized (polarity reversed) you may have a lot of damage.
The main fuse isn't the last one you need to replace.
To measure them, you should have some kind of multimeter and it would help for the other tests as well.
(They can be had for <$20 US at electronics stores or, for a few bucks more, auto parts stores.
Any of them are accurate enough for home use.)
If that has happened, the alternator could well be fried; the output diodes are oriented so that they would have looked a lot like a piece of wire to the battery and while they are rated at high amperage (100 amps or so) the battery could have supplied twice that and caused them to fail.
You need to measure the terminal voltage across the battery.
Normal for a charged battery is 12.6 volts, charging at an idle 13-13.5 volts and maximum at any RPMs, ~14.3.
If the main fuse was blown, I suspect the battery was installed incorrectly.
SOURCE: Blows fuse wont start
More than likely its being caused by a short-circuit to ground in the wiring in your Cranking Circuit.
If it blows the fuse immediately after installing the fuse, its probably a hot-wire. If it blows it the second you try to crank it over, its probably one of the wires between your ignition and the Starter Relay.
To track down the bad wire you'll need a Wiring Schematic for the vehicle and either a Digital Volt/Ohm-Meter or Test-Light and a basic understanding of wiring which is... honestly a little hard to explain over the internet. However, that is the only course that can be taken without taking the vehicle to a qualified Dealership Technician.
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