5 Best Waterproof Electrical Connectors for Automotive

As a rule of thumb, the electrical systems, wires, and switches in your car should not be exposed to water. Moisture can cause a lot of damage, especially in wet climates. Some of the signs you may notice on your wires include worn insulation, shorts, and oxidation.

This is common where electrical components are not sealed. Wire connections and connectors that are not weatherproof will eventually fail when exposed and cause your car’s electrical systems to quit functioning.

As such, it’s important to make sure that the electrical connectors you use in your repairs are waterproof. They don’t usually cost much. In this guide, we’ll cover 5 of the best waterproof electrical connectors you can get for your automotive repairs.

Best Automotive Waterproof Electrical Connectors

  1. Kuject Solder Seal Wire Connectors
  2. Muyi Pin Wire Connectors
  3. Ticonn Heat Shrink Butt Connectors
  4. Wirefy Heat Shrink Wire Connectors
  5. Gwhole Electrical Wire Connectors

1.    KUJECT Solder Seal Wire Connectors


Kuject wire connectors are made using Polyethylene and Tin. The former acts as the insulating material and the latter as the contact material.

Each connector has an IP67 water-resistant rating. Once heated, they shrink to prevent water from getting inside. They also include two hot melt waterproof adhesive rings that help to keep away moisture.

The hot melt adhesive inside and polyolefin tubing outside add extra strength and protection to the connection. This means that your car’s electrical components stay protected from water damage at all times.

The pieces are solderless and crimpless. No crimp tool or solder is needed. Unlike regular shrink butts, you don’t need a crimp tool and a heat gun. All you need to make a connection is a heat gun at a controlled temperature. Do not use a lighter or a torch.

The manufacturer recommends setting the hot air gun at about 400 – 6000C (752 – 11120F). The butt connectors have a shrinkage ratio of 3:1. They start to shrink at 800C (1760F).

The solder ring starts to melt at 1110C (2320F) and melts completely at 1380C (2800F). All the connectors have a temperature rating of -670 C and 2570C (-88.60F – 490F).

You can get these wire connectors in packs of 120, 160, 200, 270, 330, 400, and 420 pieces. Each pack contains white, red, blue, and yellow butt splices. The colors differentiate the wire specifications.

ColorDiameterCable Cross-sectionWire Gauge (AWG)
White1.7 mm0.25 – 0.34 mm226-24
Red2.7 mm0.5 – 1.0 mm222-18
Blue4.5 mm1.5 – 2.5 mm216-14
Yellow6.0 mm4.0 – 6.0 mm212-10

Unlike other wire connectors, these are designed to remain flexible even after heating. They fit well in confined spaces and are the best for automotive applications.

It’s good to note that KUJECT Solder Seal Wire Connectors adhere to ISO 9001:2008, ROHS, SGS, and CE standards and are IATF16949:2016 listed.

This means they meet the latest standards set by the International Automotive Task Force. They are safe to use when modifying or repairing different vehicle makes by companies like GM, Chrysler, and Ford. They are the best waterproof electrical wire connectors for automotive applications.

Here’s what buyers have to say:

“I’ve worked on electronics for years – I have soldered/heat shrinked wires of all sizes – I have used different crimp connectors over the years as well. I did not expect these would work as well as they show on the videos. I was wrong. They work very well.”

“I brought these to connect some wires on my car that are hard to reach with normal connectors due to being hidden and little or no space to use crimp or scotch type connectors. The plastic ends shrink with the solder going soft to leave a strong waterproof sealed join. A great idea, it’s a pity they weren’t around years ago.”

2.    MUYI Pin Wire Connector  


MUYI electrical connectors are pin wire connectors that come in two – a male and female pigtail connector. They are insulated using nylon material and are best used for cars, trucks, boats, motorcycles, and other similar applications.

A high-quality rubber seal is included to make the connectors dustproof and waterproof. The PA66 nylon also comes with a certain thermostability and makes the pigtails wear-resistant.

Each connector comes pre-assembled with 16 or 18 AWG wire. The wire measures 10 cm (4 inches) and has an operating temperature of 100C – 800C (500F – 1760F). It hangs off the end of the pigtail.

When using these connectors, simply solder or heat shrink the wire to your connection using a butt splice. The plugs are already assembled. You just connect them to the existing wiring.

Each package contains 5 male and 5 female connectors. You can choose between 5 different types of pins, i.e. 1, 2, 4, 5, or 6 pin way.

The copper-stranded wires solder together well. The connectors remain robust even after long use. Again, it’s good to note that these are pin connectors that go into a socket connector.

For better durability, it’s recommended that you dab a bit of dielectric grease to reduce oxidation in high humidity areas and to make it easier to disconnect the pigtails in the future.

Here’s what buyers have to say:

“I bought these to wire up led lights outside underneath my 5th wheel trailer and to wire up low current outside devices like marker lights and backup alarms. To this end, they work pretty well.”

“Just what I was looking for to wire up some led lights to my Atv. I was pleasantly surprised by the wire size and quality. They are nicely made and have a good quality, thick insulation. Plenty of capacity to run a 1.5amp light!”

“Decent connectors with 16-gauge wire. Wire strands appear to be straight copper–none of the cheap copper-clad aluminum or pure aluminum wire that many vendors sell (often without telling you). Using them for quick releases for rock lights mounted under a Wrangler.”

3.    TICONN Heat Shrink Butt Connectors

The Ticonn heat shrink connectors differentiate themselves from the other butt connectors in that they need to be crimped before being heated.

Once you strip the wire insulation and insert the wire into the connector, you’ll need a professional crimper to crimp the barrel. This provides a firm connection that is then reinforced using heat.

The manufacturer recommends using a hot air gun to heat the connector evenly. This allows the adhesive to flow and fill any gaps inside the terminal.

Ticonn butt splices are made using polyolefin and a thick copper barrel. The barrel is what secures the connection after crimping. It minimizes voltage drop, heat, and enhances current flow.

It also reduces the risk of shorting the circuit or developing any problematic wiring. The thick copper layer provides better conductivity and the perfect shape. It is also tinned to prevent corrosion.

The manufacturer included a dual wall design in the insulation tubing with a heat-activated sealant. This makes the connector waterproof and flame-retardant. The seal is water-tight enough to ensure everything connects correctly.

You can get these butt connectors in three colors – red, blue, and yellow. They are also available in three different sizes.

ColorSizeCross-sectionWire gauge (AWG)Amperage Rating (Max)
Red4.80.5 – 1.5 mm222 -1819A
Blue5.81.5 – 2.5 mm216 – 1427A
Yellow6.84 – 6 mm212 – 1448A

Ticonn wire connectors have a shrinkage ratio of 3:1 and a minimum shrink temperature of 1750F (800C). The recommended operating temperature ranges between -65°F and 255°F (55°C – 125°C).

You can get them in packs of 60, 100, or 400 pieces. These are available in convenient storage cases. You can also opt for separate purchases of 120 yellow pieces, 200 red pieces, or 200 blue pieces.

The manufacturer offers a 30-day money-back guarantee for buyers that not satisfied with their purchase. This includes a 24-month warranty and a 100% satisfaction guarantee for risk-free shipping.

Here’s what buyers have to say:

“These connectors have made my life so much easier while working on car audio. Outstanding quality and great crimp grip. I wish I had discovered these much sooner and saved a lot of headaches for myself during installations. Buy with confidence.”

“Great value…my son’s a mechanic and he’s the one that uses these. I heard no complaints so they must have gotten the job done!”

“Used these for a fog light project on my truck and some camper wiring repairs. They are a great value for the money and work very well! They are quality material and build.”

4.    WIREFY Heat Shrink Wire Connectors

Wirefy offers a kit with a variety of different types of heat shrink connectors that you need to carry out your automotive repairs. This includes heat shrink male/female spade terminals, butt connectors, rings, hooks, and forks.

The connectors are made using polyolefin, double-wall, and adhesive-lined tubing. Once heated, the tubing shrinks to about 1/3 of its size (3:1 shrink ratio). This creates tight insulation against oil, acids, salt, water, and dust.

Less heat is required when compared to other types of butt connectors. This helps to reduce the risk of melting your wire insulation. The heat-activated adhesive also protects against vibration, strain, and abrasion.

The terminal barrels are brazened for strong crimps. The connectors are easy to crimp and do not split. They provide a rock-solid link that keeps the wires secure and firm.

Pure copper is used to improve current flow and a tin coating is used to protect the metal from rusting. The connector is also heat-resistant so you do not have to worry about using it in your engine compartment.

The butt connectors are color-coded according to the wire gauge to help pick the right connector size for your wires.

ColorCopper Terminal ThicknessWire Gauge (AWG)Amperage Rating (Max)
Red0.7 mm22 -1619A
Blue0.8 mm16 – 1427A
Yellow1.0 mm12 -1048A

Wirefy wire connectors have a temperature range of -670F – 2570F. They have a voltage rating of 600 volts.

You can get these connectors in 120, 270, or 540 piece kits. Each kit comes with a convenient storage case that makes it easy to access and store your pieces. Every purchase is backed by a lifetime warranty.

Here’s what buyers have to say:

“These are some very good connectors. Little things like center lines on butt splices, good clear markings, and protective insulation on female spade connectors make a big difference in how I view an electrical connector. I’ll be buying another one of these sets.”

“I used these to re-install a 12v fuse box and related wiring into my t5 campervan. Absolutely cracking finish compared to the usual crimped connections. A bit pricey but definitely make a good job.”

“Again I used them for the first time today and straight forward and easy to use. They do provide a good secure grip I used a cordless solder/heat device to get the plastic to shrink. Far better than trying to crimp connections.”

5.    GWHOLE Electrical Wire Connectors

Gwhole makes unique waterproof electrical connectors that can be used in various automotive applications. The connectors use a special gel that keeps cables safe from moisture while ensuring a secure connection.

They feature a pigtail electrical connector made using flame-retardant nylon. It measures 0.94 inches (24 mm) long, 0.9 inches (23 mm) wide, and 0.67 inches (17 mm) high. It has a max recommended voltage of 600 volts.

The two most prominent features are the oil-based sealant that keeps cables free from water while providing a solid connection and tin-plated brass elements that ensure conduction and prevent corrosion.

Each connector is suitable for cables with a wire gauge rating from 22 AWG to 14 AWG and a cross-section area of 0.64 mm2 to 2.05 mm2. It can be used to connect 2 or 3 wires.

Size (L x W x H)Voltage Rating (Max)Gauge Rating (AWG)Cross-section (mm2)Wire connector type
0.94 x 0.9 x 0.67 in.
(24 x 23 x 17 mm)
600 Volts22 – 140.64 – 2.05IDC

To assemble your automotive connection together, insert the wires into the pigtail and close the blue cap. Squeeze the cap with a crimping tool or pliers until it fits perfectly inside the white cap. This helps to release the oil-based sealant and create a solid connection. You do not need to strip the wires first.

Gwhole electric connectors are CSA certified, UL listed, and RoHS 2011/65/EU compliant. This means that they are safe to use on your automotive repairs. They are available in a pack of 20 pieces and are the best waterproof electrical connectors for automotive applications.

Here’s what buyers have to say:

“There are a few different types of waterproof connectors but I prefer this type especially when I have to connect three wires as you simply insert all three wires(be sure they are all the way in) and then squeeze with a good pair of pliers.”

“I used them and they worked like a charm!! I was impressed by the fact that once I clamped them closed with pliers, more goo came out of the holes, sealing them perfectly. I’m a happy customer and would buy these again.”

On That Note

Most car manufacturers take into account the amount of rain a car might be subjected to. They incorporate different protective measures in the design to ensure the electronics and interior stay dry. Your car electronics should always stay protected from water.

This is because water may contain electrolytes that can sometimes cause short circuits. When carrying out automotive repairs, be sure to use the best waterproof electrical wire connectors only. Avoid cheap knock-offs that can cause problems to your vehicle’s electrical systems.

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