I have a really nice kenwood amp that hasn't let me down until now. It powers my 12" Pioneer sub. Anyways I put a new fuse in, it asks for a 40 amp. I got a packof them. The amp already blew two fuses in less than five minutes.

Why is my fuses blowing so quickly? Help me please...

 

Check the ground. Don't just wiggle it around, take it loose from the car and clean (sand) the surface where it has been mounted. Usually the first place to look. You haven't changed anything recently, and this just started happening?

 

Yep it just started happening, I'll try that tonight. Thanks

 

Something is partially shorting out.

Remove the speakers and unplug the RCA inputs to the amp.

Power up the stereo and observe the fuses. If the fuse does not blow,
you are dealing with a speaker load issue.

If the fuse blows without a load connected, or input signal the amp is
the problem.

You can also check the voltage supply to the amplifier. With the engine
off, you should read about 12 Volts DC. With the engine running, it will
jump to about 14 volts.

If the meter reads much higher than 14 volts, your alternator regulation is
screwed. The increase in voltage is causing more current to flow and blowing
the fuse.