Ok VanPeebles, there we go.
I hope you still have the control box, 42 on the parts list
The Black (minus) cable is connected to the side of the engine and is split so you have another black (negative) wire, for the lights, horn, etc.)
The red batterycable is connected to the control box
this is the thick red one on the left upper corner.(on the picture here) There you see a grey cable as well, it goes to the power-on switch on your steer. The upper left red wire is also connected to the left under connector, (the red connector wire with the blue band). And the yellow wire (right under)goes to the other side of the power-on button( as a return from the grey one) on the steer. On the right up side of the control box is the connection wire to the positive pole of your engine.
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Remember, I did not make this myself, I just give you the pictures to show you how it is connected in my old C5.
Anybody with more understanding of this matter is welcome to reply or clarify. Better before you try it
I hope you get some help out of this explanation. My technical English is not so good.
Lots of succes
Frank