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Old 11-07-2013
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Heat Shrink Terminals

Do you have to use the special marine terminals with heat shrink on them, or can you use a normal terminal and put your own heat shrink over the terminal ? The reason I ask is I have a few terminals that I'd rather not do over if I can just heat shrink over them.
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Old 11-08-2013
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Re: Heat Shrink Terminals

Nylon terminals with heatshrink over are ok, but more time consuming than terminals with heatshrink. It is also not as easy to get a good seal near the ring part of the terminal. Here is a link with all the details:
Marine Wire Termination Photo Gallery by Compass Marine at pbase.com
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Old 11-08-2013
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Re: Heat Shrink Terminals

Excellent link Brian,

In crucial areas around heads etc I use both quality connectors shrink them and then quality shrink wrap. The key is quality products and professional level crimpers as shown in the pictures.
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Old 11-08-2013
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Re: Heat Shrink Terminals

Unless you can detach the wire from the other end and slide it on, you typically can't get the proper size shrink tube over a previously installed connector.
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Old 11-08-2013
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Re: Heat Shrink Terminals

From the question, I assumed that the OP was installing the connectors himself, in which case he should be able to put the shrink tube over the wire, then attach the connector for a good fit.
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Old 11-08-2013
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Re: Heat Shrink Terminals

If you want to use your own terminals and then heat shrink over them then you'll want to use uninsulated terminals with the correct crimp tool. This is a a different tool from an insulated crimper.....

The crimp dies are different depending upon who's uninsulated terminals you use:


It makes a different style crimp with a bare terminal..


Even when you put heat shrink over it the water tight integrity is usually not as good as a factory made terminal...
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Re: Heat Shrink Terminals

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Originally Posted by Maine Sail View Post
Even when you put heat shrink over it the water tight integrity is usually not as good as a factory made terminal...
Can you explain that last part? I probably just am not familiar enough with the factory made heat shrink terminals.
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Re: Heat Shrink Terminals

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Originally Posted by jimgo View Post
Can you explain that last part? I probably just am not familiar enough with the factory made heat shrink terminals.
Sealing the exposed wire end becomes difficult when it shrinks. Factory made terminals are made in a jig that creates a seal around the metal part of the terminal and limits "pull away" from the metal part of the terminal..


Good quality factory made terminals rarely pull away during shrinking (maybe 1 in 150) like making your own can lead to... When I see "home made" heat shrink terminals approx six out of ten have a gap between the terminal and the shrink.... Most owners don't even notice but the reality is that approx six out of ten of them are no better than a standard terminal yet the owner spent a lot more time making them...

This is an exaggerated example but shows the gap that is often created when making home made heat shrinks.


Not saying home made HS can't be done, it certainly can, but the repeatability and time it takes to make them correctly is more tedious than a factory made terminal and requires an additional set of terminals and crimpers...
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Re: Heat Shrink Terminals

Thanks! That's what I wasn't envisioning. In my mind the shrink was just on the wire-end. Makes more sense.

For the DIY'er, who isn't doing hundreds or thousands of these, I wonder if a really narrow bead of something like tefgel or 5200 at the end of the heat shrink might work. Of course, you'd have to be careful not to let it get onto the wire...
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Re: Heat Shrink Terminals

What are all your thoughts on using liquid electrical tape? Water tight, air tight and conforms to anything. Couple of coats and good to go. Also, can be removed relatively easy. And come in colors. I use it on everything.

I even use it over terminal blocks after connection is screwed down, over the screw and all...
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