Good call on the owners manual. Check the color coding. Depending on what cable/ plug you buy it may be wired differently than in the manual. Check out what wire goes to what pin on the plug and compare to your manual.
For an FB (if that is what you have, remove the mattress and unscrew the forward section of plywood. Access is improved quite a bit then. The cable comes up through the floor and is sealed with black sealant - you will need to carefully dig it out to get the new cable through. Not hard but tedious.
2015 27FB International Signature "Danielle"
ProPride / 16" wheels / 600W solar / 864 AHr Lithium
Victron MultiPlus Inverter / BlueSolar / ColorControlGX / BMV 702
Porsche Cayenne Diesel