have 200hp mariner 1996.have alarm going off but it is not heat or oil. when i disconnect spark plug wire from 1,3,5 cylinders the number 1 cylinder does not change. the others act like they are not firing. wondering if could be switch box as the green wire from oil module goes to number one cylinder post. short of repoalcing coil before switch box is there way of testing coil. thank you
