I recently put headers on my 72 k5 blazer, well after i finished that and my exauhst i cranked it up to see how it sounded, well it sounded sweet, but then i went to turn it off and it didn't turn off. I had to unplug my alternator and unhook my battery to turn it off. I tried replacing the electrical part of the ingnition switch and that still didn't fix it. Does anyone know what it might be? if you do please help!