rockford fosgate bd1500.1

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hi all.firstly forgive me if i opened a new thread in the wrong place.please direct me here moderators.

now then.i got a rockford fosgate bd1500.1 from a friend that goes into protect when powered up.so i took it apart and found one fet reading short.its irf3415 i'm assuming this is in the output section.so i disconnect this fet from the board and tried startin the amp again.this time it draws excessive current from my power supply and blows the fuse.all the while its whining a lot too.i tried desoldering the red + black wire to isolate the amplifier section and it starts up ok idling at around 2 amps.also tested the transformer and its output is around 59 volts ac.

please lead me as to where else i must check now..
 
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