ok so boat ran good, ran it for about 5 min then stoped to check everything out. went to start it again and the battery was pretty much dead

barely got her started again and took it off the water. so either the alternator is bad or its not wired up right

we wanna re wire the whole boat, (wire job sucks..every wire is black also) anyone know someone cheap that will re wire? or anyone have a good wire diagram for a 460 ford with oil presure, water temp, rpm, and volt?