There is a bunch of corrosion on the positive battery terminal , enough that I can't even see the battery post. So that's my first step is to soak it in baking soda. Then check the grounds. I was gonna do the big 3 anyways due to having 120 amps of current being pulled under load. Probably the best easy upgrade you can do IMO. I was also told that the headlight switch on the steering column has caused these same issues. ???