Hello, I am just about finished installing a Nak head unit, amp and subwoofer into my 1993 SC300 which came with the premium system. The problem happens when I connect the 3 wiring harnesses into the Nak amp. The 20 amp fuse under the hood keeps popping. I hooked up the premium amp, sub amp, and CD changer back, and the fuse is fine. It's only when I hook up the Nak amp that the fuse blows.

Now before I assume I have a bad amp, I basically unplugged the harnesses from the sub amp and pioneer amp and plugged them into the Nak amp. Are there any additional modifications I need to make for the harness? Any wires that shouldn't be connected?

I know someone said i should run a separate power line for the Nak amp, but the fuse shouldn't blow just by me connecting it up, right?

Any help is appreciated.