zapco amp blowing fuses

The power supply is a circuit made up from the sorts of components you mention. I do not recommend that you start poking around under the hood unless you know what you are doing.  Take the amp to a shop that can do repairs.Support the12volt.com

Remove the clamps off of the leftmost devices in the picture.  Using an ohm meter set to the Diode test function, check from the middle leg to the rightmost leg of each of the devices.  Post the numbers you get for each device.

Honestly... I admire your chutzpah, but even *if* you are familiar with the components, and can use a DMM, if you don't even know which end of the amplifier circuit board is the power supply, (and even with i am an idiot's help - I've seen him help people fix literal basket cases) PLEASE follow DYohn's advice, and pay the few dollars to have it fixed... If you wreck it, it can only cost you more. Usually, the bench charge will go toward the cost of total repairs... that $70.00 will mostly pay for the total. Even sending it back to Zapco shouldn't cost more than $100.00 to $125.00, plus freight. By the time you get it back, i am an idiot will still be helping you diagnose the problems. Seriously, it's worth the money. If you decide to attempt the repairs yourself, I truly hope you are able to complete the repairs, but I have also seen it go WAY the other direction.