Nissan Repair: Radio fuse, fuse, four months

Question
Well I night this car from a friends took out his after market amp that replaced the broken bose one.i hooked up a spare amp I had searched high and low for the fuse replaced it radio worked for about four months and then the fuse blew it again so I replaced it turned on the car blew it again, after trying five times using different size s and methods I gave up what could be wrong

Answer
Hi TJ -

Assuming that the fuse you are installing is the right amp rating, you have a short ion your system, and will have to trace the wires to find a hot (power) wire that is grounded, or touching another wire.

If it blows right away rather than takes a few seconds to blow, it is a direct short.

Hope this helps -
aloha'
calvin