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Raising the bars, fitting a longer stem or moving a display often leaves the cable an inch too short, and the Julet 5-pin extension is the fix. It is a male-to-female waterproof lead in the same keyed format as the display connector on most KT, Lishui and generic controllers. Lengths from 30 to 100 cm are sold; buy the shortest one that reaches so you are not stuffing loops of cable behind the head tube. The same 5-pin format is used by some throttles and lights, so double-check what the lead on your bike is actually feeding before you order.
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Pros
Considerations
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Confirm fitment on your bike before ordering — see each part’s compatibility notes.
Best for: Replacing a dead controller on a KT-based conversion kit · Upgrading a noisy square wave controller to sine wave · Pairing with a KT LCD display
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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 KT-LCD8H is KT's color display for the same controllers that run the LCD3. It has a brighter, higher-contrast screen, a built-in button pad, a USB charging port on most versions, and the same parameter menus under the hood. For a KT kit it is the nicer upgrade, and it is the one to buy if you are replacing a broken display anyway. The screen is more prone to glare than the LCD3 in direct sun, and the integrated buttons mean the whole unit mounts near the stem rather than splitting display and pad.
Best for: Upgrading a KT-LCD3 to a color display · Replacing a broken KT display on a kit bike · Riders who want a USB charging port on the bars
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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.
Best for: Re-plugging a throttle, brake or PAS lead with a broken connector · Adapting bare-wire components to a Julet harness · Kit builders keeping a selection on hand
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