so the engine is (or was) back together and all fluids filled. and i went to go crank the car to build up oil pressure before attempting to start and all i heard was an audible click, just one. thought it might have been the battery since it's been sitting and being used by a friend since mine went down. same thing happened. i double checked the wiring with another cobalt that's here in my apartment complex and everything looked good... for reference, i have the battery positive cable and alternator power on the top nut on the starter and the single purple wire connection hooked up to it.. bad starter then, correct? there aren't supposed to be any ground wires anywhere are there? help is appreciated, thanks!

 

Nobody? Well the starter tests good... Any ideas?