I have done all except the ten pin connector which, quite frankly, I don't know that I even know what to look for... either the connector itself, or the likely place to find corrosion once I do find it. Probably the corrosion would be obvious. Will give it a shot and then, if unsuccessful, I'll hook my trusty trailer up to my vehicle and head for the boat hospital. I do appreciate your attempt to help. I think this one may be beyond me. My wife says I'm too stubborn or tight to pay someone to fix it. There's some truth to that.
Best regards, Wallsy