I have been fooling with my 50 Pontiac trying to get it started. I had the 6v battery charged and tested it checked out with a good bill of health. I hooked up a temporary ignition switch. (batt to batt, ing to coil, and sol to starter.) bypassing all the chewed up 60 year old wiring. At this point the car cranks but to slow to fire. Now that im done rambling on about the stuff I did, what I need to know is why would it crank so slow and super heat the batt cables? The batt cables look small like on a modern car, and how bad of an idea is it to try and crank with a 12v batt. Any advice would be a great deal of help. thanks.