89 ford f-450 superduty battery keeps burning out after i turn it over 3or4 times found two relays had crioudit wires replace them and still have problem help please

it cold be that the starter is just pulling so many amps that it is burning out the battery. have you tried replacing the starter and seeing the battery does the same thing. if I were you I would go deep cycle and 1000CCA even look for a industerial battery as long as its 12 volts like farm use battery or heavy equipment 12 volt battery. I would still replace the starter though I'm guessing that is where the problem is if not in the wiring from the battery to the ground and to the starter.

thank you i will try and let you know what happens