I think I have a couple of 6 port J-boxes that I'll never use. Just have to find them.Thanks - interesting that it came with my 502 yet the install directions don’t show it.
I bummed to find out I need another jbox and cable after talking again with merc. It turns out the drawing I sent you only shows the final box as you drew. Mine has a jbox for each engine and a connection harness between them so I thought connecting to either box would work. After my call today with the guy who made that drawing, said I need another “y” cable and another 4 port.
What the hell it’s only $$$.