I have a 1989 740 Turbowagon. I drove to work yesterday and the car started fine. I stopped to get a soda and when I came back out the car would crank, but not start. I had to have it jumped. Later that day I went to the store at lunch, same thing. I put a new battery(larger 855 cca) in it thinking that the old one wasn't holding a charge(it was 6 years old). Ran fine going home. Today I drove to work fine but now that i am here it is not starting again. It cranks but it won't start. I have a 45 minute drive to work and the amp gauge read slightly over half. All of the wires appear to be good and the motor doesn't crank slow at all. Any suggestions.