PEV, E-Bike and E-Moto Wiring Solutions
Precision Harnesses for Electric Motorcycles, Mopeds, and Custom PEVs
Precision Harnesses for Electric Motorcycles, Mopeds, and Custom PEVs
From phase cable extensions to full harness builds for Onyx, Sur-Ron, and Talaria — Custom Circuitry delivers clean, tested, and ready-to-install wiring solutions for the electric ride community. Whether you’re customizing, restoring, or upgrading your electric bike or e-moto, our wiring kits make the electrical side of your build effortless.
Featured Products
Fardriver Plug & Play Controller Harness
$175
📏 Specs
• Voltage Range: 72–84V systems
• Controller Compatibility: Fardriver ND/NR/NS series (varies by bike)
• Bike Compatibility: Sur-Ron Light Bee/Ultra Bee, Talaria Sting/MX4, Onyx RCR/CTY2
• Build Standard: IPC/WHMA-A-620 Class 2
• Connector Types: JST SM, JST XH, HIGO Mini-B, Molex Micro-Fit, relay-ready
• Signal Types: UART, CAN, throttle, brakes, halls, ignition, lighting
🛠️ Features
✓ True plug-and-play — no splicing required
✓ Fully labeled for each branch (“THROTTLE”, “HALLS”, “BRAKE”)
✓ Model-specific pin mapping for OEM compatibility
✓ Supports throttle, brake cutoff, ignition, display, and lighting
✓ Integrated diode protection and optional relay branch
✓ EMI-aware design with isolated signal paths and sleeved bundles
📦 Includes
• Pre-terminated controller and bike-side connectors
• PET sleeving, labeled heat shrink, and optional relays/diodes
• Model-specific branch routing and function-tested logic paths
• Printed pinout and installation guide
• QA-verified continuity log
Onyx RCR Full Wiring Harness
$375
📏 Specs
• System Voltage: 72–84V
• Max Current Support: 100–300A burst
• Supported Controllers: ASI, Fardriver, VESC, Kelly
• Build Standard: IPC/WHMA-A-620 Class 2 w/ Class 3 on Power
• Harness Layout: Modular, relayed, and fully labeled
• Connector Types: QS8, XT90, MT60, JST, Deutsch DTM, Molex
🛠️ Features
✓ Full replacement of stock Onyx RCR wiring loom
✓ High-current silicone wire (10 AWG for battery/controller paths)
✓ Waterproof sealed lighting connectors (Deutsch DTM)
✓ Integrated fuse block and micro relays
✓ Properly routed, sleeved, and strain-relieved
✓ Pre-labeled branches for plug-and-play integration
✓ UART, CAN, and brake/throttle diagnostics built-in
📦 Includes
• Pre-terminated, fully sleeved harness
• 4-circuit sealed fuse block
• Relay modules (horn/headlight)
• Battery-to-controller + phase wiring
• Charge port lead with XT60
• Complete label and connector legend
Phase Cable Extension Kit – Pro Series
$50.00
📏 Specs
• Cable Type: 8 AWG high-strand silicone (Blue/Green/Yellow)
• Length: Custom (12”–36” typical)
• Connectors: MT60, QS8, ferrule, or lug (customer choice)
• Jacket Rating: -60°C to 200°C continuous
• Build Standard: IPC/WHMA-A-620 Class 3
• Ampacity: 150–200A+ (application-dependent)
🛠️ Features
✓ Heat-resistant silicone insulation
✓ Adhesive-lined heavy-wall heat shrink
✓ Tinned copper terminals, torque-matched
✓ Color-coded phase labeling (U/V/W or A/B/C)
✓ Optional fiberglass sleeving and bundling
✓ Individually continuity and insulation tested
📦 Includes
• 3x matched phase cables (pre-terminated)
• Optional sleeving and mounting ties
• Serialized QA inspection log
Built by the Same Hands Trusted by SpaceX and Blue Origin
With aerospace-grade materials and expert workmanship, Custom Circuitry offers elite-quality harnesses to serious DIY EV builders. Don’t risk your project to poor crimps or unknown wire gauges — get it done right the first time.
- Aerospace Standards, EV Simplicity
- Every harness is built to IPC/WHMA-A-620 Class 2 or Class 3 standards — the same standards trusted by aerospace firms like SpaceX and Blue Origin. Your bike gets wiring that’s ready for anything.
- Plug and Play
- Forget soldering and pin-matching. Our kits are fully terminated, clearly labeled, and pre-tested. Whether you’re dropping in a Fardriver controller or upgrading your Onyx RCR, installation is simple and fast.
- Built to Last
- We use only marine-grade and aerospace-rated wire, sealed connectors, and high-quality sheathing to handle vibration, heat, and road abuse.
EV wiring is critical to performance and safety.
A harness kit built by an uncertified hobbyist might seem like a bargain—until your controller shorts mid-ride, or your lights fail at 40 mph.
Many off-the-shelf kits use undersized wires, poor sealing, and lack proper labeling. They’re not tested, not built to last, and certainly not designed for the demands of electric motorcycles.
Custom Circuitry’s EV harnesses are built with Tefzel® or GXL wire, sealed connectors, and aerospace-grade workmanship. Every harness is labeled, tested, and ready for real-world use—not just showroom displays.
Don’t discover the shortcomings of your wiring when it’s too late.