Wiring Specialties Pro Series Pre-Made S14 KA24DE Engine into S14 240sxEngine/Trans Wiring Harness

Looking for the best in aesthetics, weight savings and reliability out of your harness?  Our Pro Series harness completely replaces your old OEM harness so you can forget about those electrical gremlins.

This Wiring Specialties PRO Series harness was designed from the ground-up to exceed OEM specifications for wire quality, power/ground routing. With our optimized and 'tucked' approach the end result will be a clean and worry free installation with a guaranteed start up​.​

This harness is specifically engineered for a USDM LHD S14 Nissan 240sx (95-98) with the USDM S14 KA24DE Dual Overhead Cam Engine (95-98 only) NOTE - no emissions control provided for 1997 & 1998 OBDII engines!   OBDII port will NOT communicate for emissions testing. 

Wiring Specialties offers a number of options for common performance upgrades for this product. Build your perfect harness by selecting from the available options to the right, and as always - if you have any questions, please reach out to us.

• Any KA24DE RWD from USDM S14 240sx 1995-1996 (Including ABS cars)
• Any KA24DE RWD from USDM S14 240sx 1997-1998 (Including ABS cars) NO EMISSIONS CONTROLS PROVIDED!

• Any USDM LHD S14 240SX manufactured in 1995-1998 
  
• Factory Tachometer and Speedometer are fully functional
• Alternator Warning light, Engine Temperature gauge and Oil Pressure Warning light are fully functional

• Plug and Play – simple and efficient
• NO CORE HARNESS or additional wiring required
• OEM wire colors used, where applicable
• Fireproof fiberglass sleeving used in high-temp sections near the manifold (-40°C/-40°F to +450°C/+845°F operating temperature)
• Point-to-Point continuity tested on every wire
• Constructed using exact OEM connectors and seals
• Made with high temp TXL wire with adhesive shrink tubing (-40°C/-40°F to +125°C/+257°F operating temperature)
• Wrapped in lightweight nylon loom (-94°C/-137°F to +125°C/+257°F operating temperature)
• Includes a charge harness and improved grounds
• Fully tested after production for an easy plug-and-play installation

• Main Engine and Transmission one-piece tucked harness
• Alternator charge cable
• Knock sensor connector
• MAFS connector (OEM or Upgraded)
• TPS Connector
• 4x Injector connections
• Distributor or Coilpack connectors (dependent on Ignition Option selected)
• OEM Oxygen sensor connector (wideband wiring is not part of the EFI harness and needs to be supplied)
• Ground ring terminal
• Idle control/fast idle connectors
• Engine coolant sensor and gauge coolant temp switch
• Reverse sensor connector
• Speed sensor connector
• Alternator connector
• Starter signal connector
• OEM oil pressure 1-pin connector (only 1-pin version supplied)
• Nissan Diagnostics connector
• Dash and fuse box connections through the Interface harness
• Printable install instructions with pictures
• Turn Key ENGINE START Guarantee
• Tech support for our customers 7 days a week 

• If you are running an aftermarket ECU, we can customize your PRO harness to fit your exact build requirements. Click HERE to download and submit the ECU / Build details form with your order, or we will contact you once the order is placed to collect the needed details.
  
• AEM Infinity, Link and ECU Masters products (and some other standalone ECUs) are able to process a wideband signal input wired DIRECTLY to the ECU. The LSU 4.2 Version of the WB O2 Sensor SHOULD be used, as per AEM and ECU Masters. Select the Oval or Rectangular connector style in the options to match your WB O2 connector.
• All ECUs that are unable to process a wideband signal directly, will be wired for a FACTORY O2 sensor and a labeled flying lead will be provided to connect the ECU to the Wideband controller. For ECUs that do not process a raw wideband signal, a controller must be used. Controllers like an AEM UEGO Gauge Kit or the Haltech CAN wideband unit should be used.
• AEM Infinity, Motec, Link and ECU Masters harnesses are pre-wired for Oil Pressure, Fuel pressure, Oil Temp, IAT and MAP sensor wiring directly to the ECU.   Flex Fuel support is available if desired.   ECU control of a Boost Control Solenoid is also available on most harnesses.
• Apex’i PFC conversions ONLY include the IAT sensor in the main harness. The MAP sensor is wired separately, from the PFC box directly to the sensor. MAP sensor harness should be purchased with the PFC.