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It shouldn't be. The starter is going to pull as many amps as it needs. The fuse is to protect the wiring and keep the car from catching fire in case the starter fails and tried to pull more current than it should. That being said you need to change it back. 80 amps is 33% more current than what that circuit is designed to carry. Being that it's a 1993 you should probably be on your 3rd starter by now
Read about the radio not working and you think you have a blown fuse . I had a blown fuse due to me blowing it by shorting out the dome light . After changing the fuse I had code 52 which is a low ground fault for air bags . I then looked to find the large four fuses under the hood and found that three were OK but when trying to remove the 80 amp fuse with a pliers it broke . when I got it home I pulled the battery completely out and found that the 80 amp fuse has plastic covers on both side that cover bolts that hold it in place . Removed the bolts to find that part was burnt of from the short . After replacing it all was good and hour of driving it reset on its own .
You have a 40amp fuse for the key switch, and the main component on the 80amp circuit is the alternator. I would disconnect the alternator, hook up the battery without the fuse, and use a test light across the 80amp fuse terminals to see if the short has been removed.
yes there is a fuse that controls the ignition aswell you could have blown all those underhood relay fuses, an ive seen people fry computers doing this aswell, check/replace bad fuses an if its still a no go, try an do a diagnostics check on it