Originally Posted by RDW
Is there a good way to prevent or slow this type of corrosion?
Give me some good advice.
You need to "seal" the ring connectors and any butt connectors in the system. As mitempo says then your only vulnerability is the terminal blocks.
If you are getting black or "rust" colored corrosion on terminal blocks or ring connectors then the are likely not marine
If you are getting green corrosion it is likely really old copper or non-tinned copper wire. Tinned copper wire is worth it.
So the link mitemp provides shows the right tools - I have a single
jaw ratcheting crimper. I like it because I can be precise in where I place the crimp vs. a double crimper and the ratcheting feature ensures a consistent crimp pressure.
I bought an "automatic" wire stripper. Basically you set a depth
block and then every single wirestrip will be the same length and you wont nick any wires.
Finally my preference is not to use anything but ancor heat shrinkable connectors. I also bought a small butane torch for shrinking the connectors and heat shrink overwrap.
So strip the wire, use a piece of heat shrink overwrap cut to about the first knuckle from the end of your forefinger. Slide that over the wire, insert the wire into a heat shrinkable ring connector. Crimp it once. Using the torch shrink the connector slowly at first - you will get the hang of it when the right amount of heat has been applied. The shrinkable part gets real clear. now slide the overwrap of heat shrink tube up until it is abutting the ring connector. Heat it slowly with a torch until it is sealed.
This bit will seal the ring end of the connector pretty well.
Some people use clear shrink tube and put a label under it to identify the wire. This is a great idea but I find it slow. I have a cheapie brother label maker and I just label it like a flag wrapped around the wire.
I can make a joint in less than 2 minutes.
Originally Posted by mitiempo
If the terminals are improperly done, I agree. Properly done the only potential for corrosion is the tinned eye screwed to the terminal black. Either a double crimp connector with added heat shrink or ideally a single crimp heat shrink connector will seal the wire from moisture very well.
This link will explain in detail with pics how this is done and tools to use.
Marine Wire Termination Photo Gallery by Compass Marine How To at pbase.com
Edit: Just noticed you have a Morris. They do it properly, but any previous owner may not have.
Here are some pics of the spaghetti mess that was in my boat.
1 - Spaghetti
2 - House wire used on a boat? Black corrosion
Photo 3 - Non-marine grade terminal block - red rust
Photo 4 - A collection of garbage wire and Walmart connectors
Photo 5 - Amateur hour butt splice
Photo 6 - Alien wire?