hello, I put a new battery in my 1965 mustang a month ago and just replaced the alternator because my light was coming on. When I hooked the battery back up I got a spark when connecting the negative terminal. Now the starter won't turn. I just get a clicking sound from the starter relay. The battery is new and I checked the connections they are all tight. Could the relay be bad? How do you tell? I haven't had starter problems before. Thank you in advance for any advice.