2005 Pontiac Grand Am SE 6 Cyl 3.40L
Car won't start, flatlines when turning the key on.
I have a 2005 Grand Am 6-cylinder. Short story... I came out after making several stops one day earlier in the week, turned the key and everything went dead. Flatlined. But there was still power to the lights, etc. We tried to jump it; still nothing. Have tried several things. My roommate has worked on cars for years and has been trying to fix it.
Many possibilities; weak battery, corroded battery cables, loose battery connections, loose starter cable connection, worn alternator belt, worn alternator, worn belt tensioner - to list only a few.