Hello as my second project car I have a 1966 t bird with a 428 in it. I took the starter out got it tested works fin. New spark plugs, new starter solenoid, an put my mustangs battery in it to try an see if it would make any attempt to turn over. So no lights even kick on, not the door lights or flashers, as well as when you turn the key nothing happens not even a noise. I know I have to trace back an clean all the ground wires an see if possibly dirty ground somewhere but if I do that an it doesn’t work what else would you suggest? Thank you!