[jclark003]

My last two tiaras had the shore power cord terminating at the base of the tub where it was spliced into wires that ran up the the SP breaker. If your white retractable cord runs out of the tub and under the FW tank then I would look on the other side of the tank for the cable end or just cut the existing cord outside the tub base and splice/shrink wrap the new cable to the old remaining cord.

Suggest you consult someone who knows marine electrical to get the correctly sized connectors and shrink wrap material. And it goes without saying to maintain wire color continuity.