I got this Rockford Fosgate bd15001 someone attempted to try to repair all transistors test good. I have unsoldered both pairs of red and black wires and tried to power up the amp which is still drawing 20A what should I look at next? Thanks!
You don't absolutely need a scope but that would be the best option. If you only have a multimeter, measure the DC voltage on both sides of all of the gate resistors and compare those voltages to the output of the SG3526 driver IC.
I don't know how much experience you have doing this. I'm assuming that you already measured the gate resistor for resistance and checked the PS FETs to see if any were shorted or leaking.