There are a few common reasons the fuse keeps blowing:
1. The transmitter final transistor is bad, it usually is directly connected to the 12v source and not switched by the power switch. 2. The power wires were accidentally reversed I.E. positive to ground, neg to 12v. There is a protection diode on the circuit board that did its job and is now shorted. it will keep blowing fuses until its replaced.
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Check bias and check your SWR. Also make sure your coax is not excessively leaky, and also check the loading coil inside the antenna to make sure the coil connections have not become all corroded and that their connections are sound.
Your polarity protection diode has been blown. If you tried hooking up your CB and accidentally pushed the plug in backwards. Inside the radio, there are 2 big black diodes near the transformers, D8 and D23. Replace these with the same or bigger. You can the burnt one out and the radio will work, but if you hook it up wrong again, it will fry the radio.
Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.
If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.