I do not believe that part # belongs on a 1988 model.------What is the model # of your motor ?-----Is serial # on powerhead the same as the midsection ?----From a 1000 miles away.-----There are 2 parts on the magneto plate ( 1988 model ) that are easy to test.-----A charge coil and a sensor coil.----Have you done ohm test on those?---Charged the battery ?----Load tested the battery?----Tested / inspected the starter motor ?----Remember I can not see , touch or hear your motor.