No spark and i can only get 5V at the coil.

If it cranks over good, monitor the coil+ while it is cranking. I said this earlier. If you have bare min of 10V, better 10.5 or better, it should be enough. you don't need to load test it, unless it won't "make that." Charge it up and see what you have.

Sometimes I assume too much. It's tough to troubleshoot from afar, and think of every detail