Ancor 230163 12-10 AWG Butt Connector, Yellow 2-Pack

A butt connector does one simple job, and does it where it matters. It splices two wire ends together end to end, inside a single insulated barrel. This is the Ancor 230163, built for 12-10 AWG wire and sold as a pack of 2. If you've got a bilge pump lead that got cut too short, a nav light run that needs extending, or an accessory circuit you're splicing into, this is the fitting that joins the two conductors into one solid, insulated connection. No wire nuts, no electrical tape wrapped around twisted strands. Just a clean crimp on each end.

What sets this one apart from a plain barrel splice is the double crimp funnel entry. The funnel-shaped mouth guides every strand into the barrel so none of them fold back or splay out when you push the wire in. Then you crimp twice. The first crimp bites down on the bare conductor for the electrical connection. The second crimp grabs the wire's insulation jacket, which gives you strain relief. That matters on a boat. Everything vibrates, everything flexes, and a splice that only holds the copper will eventually work-harden and break at the barrel. The jacket crimp spreads that load so the joint lasts.

The connector itself is tinned copper. On the water that's not a nice-to-have, it's the difference between a connection that lasts a season and one that lasts the life of the boat. Bare copper corrodes fast in salt air, and corrosion means resistance, voltage drop, and heat. The tin plating seals the copper off from moisture so current keeps flowing clean. Ancor builds these from high-grade electrolytic copper, so you get good conductivity and less power loss across the splice.

The insulation is nylon, not vinyl. Nylon shrugs off water, oil, fuel, chemicals, acids, and UV, and it won't split or crack the way cheaper vinyl insulation does when it ages in the sun or takes a knock in cold weather. It's color-coded too. Yellow is the standard code for the 12-10 AWG range, so when you're staring at a tangle of connectors in a bilge or behind the helm, you can tell at a glance which ones fit your wire without pulling out the gauge chart. That color coding is also why matching it to the right wire matters. Put a yellow connector on 12 or 10 gauge wire and the crimp seats properly. Use it on wire that's too thin and the barrel won't grip.

Where do you actually use a 12-10 AWG splice on a boat? Plenty of places. Bilge and livewell pump feeds, navigation and anchor light runs, blower circuits, windlass control wires, and most mid-size accessory loads land in this gauge range. If you're rewiring after a refit or chasing down a corroded joint someone taped up years ago, a proper crimped butt connector is how you put it back right. Use a crimper sized for insulated terminals, strip the wire to the barrel depth, and give each end a firm double crimp.

One honest note on water. The nylon insulation resists moisture well, but this isn't an adhesive-lined heat shrink connector. For a splice that'll sit in standing bilge water or get fully submerged, step up to a heat-shrink sealed connector that seals the ends against the wire. For the vast majority of connections behind the dash, under a console, or in a dry bilge, this nylon double crimp does the job and holds up for years. Keep in mind a butt connector is a permanent splice. Once it's crimped, you're not pulling it back apart, so measure twice and cut once before you commit the crimp. The pack of 2 is handy for a single repair or for keeping a couple of spares in the wiring kit so you're never stuck mid-project.