Re: 78 mercury firing on all 6 but running on 3
Disconnect all wires to rectifier and following the bench test procedure provided by CDI on page two. You will need a multimeter with the diode testing capability. Those type of multimeter isn't expensive.
http://www.cdielectronics.com/downloads/troubleshooting%20guide/Battery%20Charging%20Issues%2C%20Regulator-Rectifiers%20and%20Tachometers.pdf
Disconnect all wires to rectifier and following the bench test procedure provided by CDI on page two. You will need a multimeter with the diode testing capability. Those type of multimeter isn't expensive.
http://www.cdielectronics.com/downloads/troubleshooting%20guide/Battery%20Charging%20Issues%2C%20Regulator-Rectifiers%20and%20Tachometers.pdf