i installed a new radio in my jeep and now my mileage reader says "no fuse" i already checked the fuses they r fine and checked the iod fuse its not blown i dont own a tester of any kind and dont feel like like getting one unless i have to but this problem fixed it self but has come back to haunt me and wont fix itself this time any suggestions would be nice and please only educated answers please and name your source of experiance please thank you