240mph

I have a 91' sentra with a ga engine and my problem is that my ignition fusible link keeps blowing out. It starts but it will automatically die. When I put it on acc it makes a weird buzzing noise. All the dash lights are all off. The cause of this problem is unknown because it just died out of no where. I also noticed that the alternator was slight wet can this be the cause? Please help...Thanks in advance.