Once you figure out which wire goes where i would recommend adding a marine electrical bus bar.
Boat bus bar.
Blue sea maxibus 250 amp bus bar 12 screw terminal the blue sea maxibus bus bar is used to consolidate multiple wires or to feed multiple circuits.
When you are done only a 10 awg ground wire from the bus bar and your engine battery cable will be connected negative side of your battery.
Made from robust abs plastic.
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6 terminal bus bar 150a busbar block with cover ground distribution power distribution terminal block w 6 m4 screws 2 studs for car boat marine caravan rv new 4 6 out of 5 stars 10 11 99 11.
You will use this as the connection point for your boat s accessory ground wires.
In terms of parameter there are 10 connection points made from high quality stainless steel screws.
The raised bus provides easy access to multiple wires on a single screw or stud.
This busbar comes as a pair one black and one red.