[spareparts]

do you mean resitor or condensor? Mercruiser uses a resistor wire feeding voltage to the coil, if you separate the wiring harness, you'll find a small hard wire about two feet back from the coil( thats the inline resistor). You won't need the resistor that the parts store sold you. Do yourself a favor, install a pertronix electronic conversion, you wont be sorry. I've installed 100's of them, only had one fail due to low resistance in the coil( all the oil in the coil ran out thru the hole rusted in the bottom). If you decide to install one, open up the harness till you find the resiistor and cut it out, when they get old, they start to do weird things and cause strange ignition problems