1960 Johnson 75hp replacement coil?

[mikemck]

I pulled the coil out of the magneto assembly. It has one lead, the primary obviously and it attaches to the power screw.
I bought the replacement coil specified by this website. It has two leads and they are not marked.
There is a clue but I don't feel confident enough to risk $210.
The leads have ring terminals on them. One is small and fits the power screw.
The other is larger and fits the screw that holds the hold-down clip, therefore ground.
Am I to assume that the size of the ring terminals determines primary and ground or is there a test I can do to identify primary and ground?

 

[racerone]

Stop-----That coil goes not need a 12 volt scource to produce a spark.-------Get a manual.

 

[mikemck]

Thank you for your quick reply but that really doesn't answer my question.
I have a manual, ABOS MARINE 4th Edition Volume 2. It shows a two wire coil but says nothing about installation.
Do you have a specific recommendation for a manual or a test I can perform to solve my problem?

 

[Boobie]

Mikemck, where are you from ??