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Julet (and the near-identical Higo) round waterproof connectors are the signal plugs used across kit bikes for throttles, brake sensors, PAS, displays and lights. A pigtail set gives you male and female leads with short wire tails in the common pin counts, so you can re-terminate a component that came with bare wires or splice in a matching plug after a connector breaks. They are not crimp-it-yourself connectors; you solder or crimp the wire tails to your component, then heat-shrink. Match the pin count and gender to the plug on the other side.
Current price and availability are shown on Amazon.
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Confirm fitment on your bike before ordering — see each part’s compatibility notes.
Best for: Replacing a dead Hailong-style downtube pack on a 48V bike · Conversion kits using a Hailong mounting plate · Riders who want a known seller with a warranty process rather than a no-name listing
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The 1T4 harness is the backbone of most Julet-connector kit bikes: one multi-pin plug into the controller splits into a 5-pin display lead, a 3-pin throttle lead and two 2-pin brake-sensor leads, all waterproof. When a connector corrodes or a lead gets crushed, replacing the whole harness is faster than repairing one branch. The trap is that 1T4 harnesses come in several pin counts at the controller end and with different lead lengths, so match the controller-side plug and count the pins before ordering. Take a photo of your old harness's plugs for comparison.
Best for: KT and similar kits with Julet waterproof connectors · Replacing a corroded or damaged main cable · Tidying up a conversion with bare-wire connections
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The XT60 is the standard battery-to-controller plug on a huge number of kit bikes and budget e-bikes, and Amass is the original manufacturer whose yellow plugs the clones copy. Genuine Amass connectors have tighter tolerances and better gold plating, which matters on a connection carrying 20–30 amps. A pack of five pairs gives you spares for a battery swap, a controller change, or a repair after a melted plug. Soldering is required; use a hot iron, heavy wire and heat shrink, and if you are not comfortable soldering high-current leads, have a professional do it.
Best for: Replacing a melted or loose XT60 on a battery or controller lead · Conversion builders standardizing on one plug · Making extension or adapter leads
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Most modern kit bikes and a lot of budget production e-bikes use a hall-effect thumb throttle with a three-wire lead: power, ground and signal. When the throttle dies, a generic replacement with the same connector usually plugs straight in, which is why the 3-pin Julet (Higo-style) waterproof version is the best-selling type. Before buying, confirm that your throttle lead uses the small 3-pin waterproof round plug and note whether it is male or female; a photo of your old throttle next to the listing saves a return.
Best for: Replacing a dead thumb throttle on a Julet-connector kit · Riders who prefer a thumb paddle to a twist grip · Bikes running KT and similar controllers with waterproof harnesses
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