Hi, I have just aquired an older tralorboat with a 40hp evenrude outbord, 1960, the only problem is that it has a merc. wiring harnes that goes from the battery to the baot, its round plug and the one on the motor is square hens I cant hook up my electric start or choke, could you tell me where I might find a wiring harness or even the right plug? thanks for the help....JT117 