I have a 88' Bronco 351w and it is having trouble starting. It cranks the first time but won't get past it or pauses and then cranks another one or two times sometimes starting it and sometimes not. I have checked the battery voltage and the voltage when it is charging and they are both fine and ve cleaned the connections. The voltage only drops a significant amount when put under a load like starting it or rolling down more than one window at a time. Is my battery just bad or do you guys have any suggestions on what it could be ?