No spark, how do I connect the cables?

Hi

The engine in question is an 80's something Yamaha outboard 60 hp, I'm sorry that I cannot be more specific.

I can't get a spark from the plug and I'm not sure how to connect the wires.
I have:

Yellow = constant feed 12 V
Red = start engine
Brown = Signal to the start engine
Blue = electric choke

Then I have white, green and black, of which I know that black is ground.

I have the electric choke, the start engine and the signal to the start engine working, but as I said, no spark. New spark plugs tried of course, no success. Any ideas what I can try?

Many thanks in advance from Sweden

[boats.net]

If this the wires in main harness from engine to key switch then:
Yellow= 12 volts with key on
Red= 12 volts constant
Black= ground
Dark blue= choke
Green= Tach signal
White= Ignition stop circuit
Brown= Starter circuit
Pink= Warning circuit
Light Green= Power Trim down
Light Blue= Power trim up