2001 Chevrolet S-10

Electrical problem
2001 Chevy S-10 6 cyl Two Wheel Drive Automatic 11000 miles

I have a 2001 S10 with a 4.3l v6. I am not getting power to the fuel pump. We have checked the relays and they are fine ( by swapping them around with others). I did have a subwoofer and amp installed which I believe may have caused the problem, but im not sure. Any help will be appreciated.
April 26, 2009.

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