Bilge Pump circuit breaker box Searay 1988 Weekender 30'

[Petermartin]

hi all, hope someone can help. I have a 1988 30' weekender, and i am having pblms with bilge pump breaker box.. There is a panel with about 6 red buttons on it for different bilge pumps, however, the breaker keeps tripping on me, problem could be that it appears there is a wire that is no longer connected, most of the wires are red, and brown, however the one that is disconnected is a yellow wire, and i cant find the post this should attach to.
Any assistance is gladly appreciated
thank you
pete