Need weather proof T-tap for Trailer Wiring

Scott Owner/Technician Missouri Posted   Latest   Edited  

I am in need of fixing my wiring on my car hauler trailer with trailer brakes.

Specifically the factory scotch locks have intermittent connection issues.

We have always used the heat shrink crimp type butt splices, but I need a three way or T-tap type connection. The main harness runs front to back, and everything is t-tapped off the main leg.

Anybody got a good source?

Maybe a 3 leg but splice?

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Chris Technical Support Specialist
New York
Chris Default
 

3 leg splice with hot wax heat shrink would be my recommendation. Do it right do it once.

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Joe Owner
California
Joe Default
 

Solder wire to the main harness, then use heat shrink tape to seal as necessary.

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Agree
Matt Technician
Texas
Matt Default
 

Same here, I solder everything and use heat shrink with the glue on the inside for a waterproof seal.

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Jay Technician
California
Jay Default
 

While solder makes a great connection, unless strain relieved real well, often fails right where the solder stops and stranded wire starts. Have to agree with Chris above.

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Stephen Owner/Technician
California
Stephen Default
 

3 leg splice, then heat shrink. You can also wrap it in some a/c evap core tape

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Glenn Owner/Technician
Texas
Glenn Default
 

Hi Scott, Unfortunately, I know of no companies that makes even expensive 3 or 4 way splices that are shielded and have heat shrink. Most might have heat shrink on the separate crimp portions, but the center joining area, they are riveted with a soft aluminum and left open to the weather. I recommend if you use the typical blue butt splices, change up to the yellow but make sure they are heat…

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Tony Technician
California
Tony Default
 

Butt connectors are available with different sizes at each end making a Y-connection with one-into-two wire splice and crimp easy. Then sticky shrink tube the whole thing. The two size butt connectors can be had from Philmore or delcity​.​com iirc.

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Marc Educator
Texas
Marc Default
 

There is a sealed silicone Scotch lock type 3 way available with a silicone paste that works really well for this application. I'll look tomorrow and see if I can find them. I stocked them for years. I'm thinking Lawson.

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Marc Educator
Texas
Marc Default
 

amazon​.​com/Wire-Connector…

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Tommy Owner/Technician
North Carolina
Tommy Default
 

Scott, Not as good as a sealed splice, when I find I have to use a tap type connector, I open the splice up, And fill it with dielectric grease before inserting any wires. After squeezing the tap, I put more grease on it before closing the lock. Better, but not perfect.

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Conrad Owner
Minnesota
Conrad Default
 

Conrad said, "It's a 3/M connecter, been using for over 25 years, no failures."

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