Witch fuse for radio

People,use a test light,it is your best friend,when trying to find a bad fuse,or a bad circuit,it is your friend,and using it will make you feel good about yourself.Like testing to see if there is voltage to your head lamp,or to the radio,or to find a blown fuse without pulling it out and looking at it.The test light will tell you witch fuse is blown,and you will not have to look for the fuse,and if the fuse is not marked,for example ,radio,if you test all the fuses,and find a blown fuse,it will most likely be the one for the radio.The test light grounds,with a cilp on a long lead,and you touch the fuses on each side,and if the fuse only lights up,on one side,then you know that fuse is bad,if it does not light up at all,on either side,then you know there is know the fuse has no power to it.The test light is not to costly either,about 5 dollars.