Electrical problem
1988 Buick Reatta 6 cyl Front Wheel Drive Automatic 99000 miles

i replaced the fuel pump relay and the 15amp fuse the car started and ran in idle for about 15 minutes. Then i test drove it to see if the problem was resolved and i got about a 1/4 mile away the fuse and i believe the relay blew again. what would make them keep blowing like that