Yes i had the ignition switch to the on postion, my brother in law had a GM radio that had the same plug and he tried with his radio and it didn't work either , so i am wondering if there is another fuse under the dash attached to the wires that is burned .
He tested it with a electrical tester and it was like there was no current coming in from the wires, i don't see how that when i changed the alternator that the wires would not work after .
Thanks.