quite often the fuse that feeds the car radio will feed other items eg, the interior lights, or heater etc....
when the radio went down, did anything else stop working.
as it might have just blown the (for example) the 5amp fuse mounted on the rear of most aftermarket radios.
Can you borrow a voltmeter and check the voltage to the radio,,,if you still have 12-14V then the radio fuse has blown. if nothing its the car fuse.
if you haven't got a voltmeter or can;t borrow one, a 12v car bulb with 2 wires connected will do the job, ie it'll light up when fed with 12-14v.
have fun
Paul.
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