On the small Fender 15G/15R amps, if the power amplifier IC is bad it will immediately blow the fuse when powered. To check the the IC you have to remove it from the chassis and measure the resistance between two of its three legs. You need to find a schematic for your amp online and measure at the test points with a meter as a starting point.
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To blow a fifty amp fuse would take a major short circuit, referred to as a 'dead short' this means that a wire with 12 volts positive (+) is in direct contact with an Earth (-). If you follow the path of the power you will find where this is happening. sometimes you may need to temporarily disconnect some contacts
The reason your blowing fuses is the amp needs at the least a 150 amp fuse on the wire that runs to your bat. There are fuse blocks that you can put 4 40amp fuse and theres the high dollor ones that you can put all the way to 200amp. When you trun up your amp its drawing to much current for the little 40 amp fuse that you have and will blow it everytime. I recomend Running a 4 gage wire to bat and ground with same. Get you a 150 or above amp fuse from a car audio shop somewhere. anyway sounds like from what you decribed, theres nothing wrong with your amp just the wires and fuse are not big enouf to handle the current that your amp pulls.
What main fuses? Fuses in the car electrical system? If so, your amp is too powerful to run through the cars electrical system, you should get a heavy guage wore ran straight from the battery, with its own dedicated fuse placed in-line, ad close to the battery as possible. Wait, is this a bass guitar combo??? Open it up, if there's wax coming from the power supply, thats prolly the culprit. Check for any obviously blown resistors or any short circuits. But most likely, its not gonna be user-servicable.