stereo power amp

What could be wrong with this car stereo amplifier?

I installed car stereo from my brother to him a couple of weeks. At this point, it worked perfectly fine. Suddenly began to blow the 30 amp fuse that is in the amplifier, and no fuse power line, but fuse style fuse box that connects directly to the amplifier. I changed four times now and each time you change blowing again in seconds. Is it more probably a wiring problem or something in the amp? Any suggestions are appreciated. Thank you!

Or is it something inside the amp that is pulling too current. It may also be the alternator is not drawing enough current. If the battery is low volts and the alternator is weak, then the low voltage will the amplifier to pull more current than usual to get the same watts. have the alternator and battery tested. an equipment dealer can do this.

Stereo TDA7293-Endstufe / Stereo TDA7293 power amplifier [TEST]