when a fuse blows the engine stops running

There is an intermittent electrical short somewhere in the engine control system. You need to take it to a shop who can trace down the problem. Which relay was replaced? Were the correct one was used?? Zee

Loose connection to the main relay/fuse block in the engine compartment. Common on all Sprints/Sidekicks/Swifts. Remove the relay fuse block, look at where the positive power from the battery enters it, bet you'll see loads of carbon!