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I need to hook up the power for my fish finder to the accessory switch. Nothing is currently powered by the switch. I'm assuming the wires already hooked up are bringing power to the switch. I see 1 empty prong for the hot wire (I hope), but where do you attach the ground? I see a prong in the top right corner with 2 black wires attached, do I just splice the ground into those? Any insight would be appreciated.
2014 SS 231 w/ Yamaha F250