Frisco E-Bike
Close-up of bicycle gears and chain

Representative photo. Product photos and current options are on the Amazon listing.

Wiring Harnesses

Julet 1T4 Main Wiring Harness (Display, Throttle, 2x Brake) (generic)

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.

KT and similar kits with Julet waterproof connectorsReplacing a corroded or damaged main cableTidying up a conversion with bare-wire connections

Current price and availability are shown on Amazon.

See Current Amazon Listing

Affiliate Disclosure: We may earn a commission when you purchase through links on this page, at no additional cost to you. Details

We link to Amazon search results for this model so you always see the current listing and variants. Amazon is the seller; we are not.

Key considerations

  • Match the controller-side plug pin count and gender
  • Some harnesses include a light or PAS branch (1T5/1T6) — get the one your controller expects
  • Lead lengths must reach your display, throttle and both levers
  • Plugs are keyed; never force them

Pros

  • Clean, waterproof wiring
  • Replaces several cables at once
  • Inexpensive

Considerations

  • Pin-count variants
  • Protocol still depends on controller/display
  • Lengths may not suit long bikes

Compatibility notes

  • Controllers using a Julet/Higo-style multi-pin main connector — match pin count, gender and branch set to your existing harness

Keep it running

Replacement parts

Confirm fitment on your bike before ordering — see each part’s compatibility notes.

Compare

Similar alternatives

All wiring harnesses →
Tools hanging on a repair shop wall
E-Bike ControllersFeatured

KT 36V/48V 22A Sine Wave Controller

KT (Kunteng) controllers are the de facto standard in the conversion-kit world, and the 22A sine wave unit is the one most people end up with for a 500W–750W hub motor. Sine wave drive is quieter than square wave and smoother off the line. KT controllers talk a specific serial protocol to KT displays (LCD3, LCD8H and friends), so if you already have a KT display this is the natural match; if you have a different display, plan to replace both. Connectors are typically the Julet/Higo waterproof style, which makes wiring tidy but ties you to matching plugs.

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

View details & where to buy

Sold on Amazon

Electric bike handlebar and display detail
Wiring Harnesses

Julet 5-Pin Display Extension Cable, 30–60 cm (generic)

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.

Best for: Riders who raised the handlebars or changed stems · Cargo and long-tail conversions with long cable runs · Relocating the display to the center of the bar

View details & where to buy

Sold on Amazon

Close-up of bicycle gears and chain
ThrottlesFeatured

Thumb Throttle with 3-Pin Julet Waterproof Connector (generic)

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

View details & where to buy

Sold on Amazon

Affiliate Disclosure: We may earn a commission when you purchase through links on this page, at no additional cost to you. Details