I own a boat and I can't think of a worse environment for corrosion and stress on wire. For years I have used tinned copper wire made by Ancor for ALL of my wiring projects on the boat, the motorcycle and car. I don't think you can go wrong with this wire. http://www.marinco.com/brand/ancor This is a great thread to read through to go back to the basics. When I crimp I use a ratcheting crimping tool to make sure I get the correct amount of pressure on my connectors and as originally suggested I try to solder my joints/connections and follow with shrink wrap. I also will add at times certoplast 525 SE tape (the tape BMW uses to wrap its wire looms) although it is a pain and if running a few wires from say a fuse / power box like a FZ-1 or PDM60 I will run the wires in a braided sleeving http://www.cabletiesandmore.com/BraidedSleeving.php for added protection.