1970 Merc, Model 650, s/n:2804359 Thunderbolt Ign. I have no spark. Battery is full charge and engine cranks good. Voltage to the RED & White terminals on control is 12.5 volts with the key on. All grounds have been checked and cleaned. I would like test procedures for the control and coil. I feel the coil is bad. I read .1 ohm on the primary. Also need good source for coil and control if needed. Thanks
