75A alternator fuse melted...and battery keeps leaking...need help...

[240esseckz]

i was wondering what was wrong...first my battery started leaking...(new battery) than i got another, that one is leaking, and my alternator relay(75A) on my fuse box melted...i was wondering what was wrong...i bought some new battery cables before this started happening...4guage negative, 2 gauge positive, someone told me to ground the negative, i did...the melted alternator relay got hot again, melting more...plus still leaks battery...i was also wondering if i can drive with the relay melted...until i am able to replace...please let me know...thanks...

[vancouverbc]

it's a 75 amp fuse. you must have installed the battery cable wrong. of course don't drive it.