B4 I fry my CL77 coil

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Set up my 62 CL77 Dream 305 engine on a bench stand . Before removing it started fine . Currently having a switch that turns it over . Another switch supplies power to the coil . Haven't had much sleep lately so wanted to verify with the experts (before I do something dumb ) that the black wire going to the coil is positive , green wire is negative . Also , it's been a friends so that contributes to the brain fog .
Thanks in advance !

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Here's a wiring diagram for a CL72. CL77 will be similar. Note the wire colors at the Coils.