I have a 95 Blazer 2 door 4WD. When I tried to start it up the other night it did two very weak attempts at turning over and then just quit. I have had the battery and alternator checked, battery was good alternator wasn't. I replaced the alternator and it still will not crank. When I turn the ignition there is no noise or movement from the engine transmission or starter. Should I pull the starter next and have rbst checked, or could it be bad spark plugs? I am very new to all this. I do know for certain it is not a fuse as I have checked all of them.