focus ZX5 burn relay

I need help!!! my focus burn a relay of 20 amp and turn of the car, y have to release the battery and then put the new one relay, but after a 3 days burn it again, someone can help ??:banghead:

Which relay? Check all electrical grounds, and make sure the battery cables are clean. Dirty grounds = resistance= heat= burned or sticking relays/solenoids.