I just put a new battery in my boat, but after I try to crank her a few times the battery loses al power. I have checked all of my switches and electronics and nothing is left in the "on" position. I hooked a multimeter to it and after a few cranks it would only be at 4 or 5 volts, but it would slowly gain voltage if her let her sit fo a few minutes. I'm not sure of what else to do or where to check and I'm scared of taking her out and being stuck with a dead battery on the water.