ANCOR recommends yellow wire as DC negative because black is the standard color for AC hot. There have been many cases of people working on their DC systems who have inadvertently cut the live AC wire. Because of the wide spread use of inverters, power generators and shore power connections, even today’s smallest boats pose a risk of inadvertently cutting into AC wires when working on DC systems.
Part number 300254 is for the 12VBR and 12VBRS2 sealing cap for trolling motor recepticles .
Part number 300100 is the rubber cap for the 12VRC, 12VRC.PG, 12VRC.OEM, and 12VRCY,