Introducing the first totally plug-and-play engine harness system to control the Ford 7.3 Godzilla engine with Haltech NEXUS VCU's!
Tech Resources
Full harness instructions coming soon!
OEM Oil Pressure Sensor Scaling Data
Oil System Plumbing Reference - Eliminating PWM Regulation Solenoid
Features
- Manufactured 100% from scratch, in-house, in the USA.
- Modular system is extremely flexible and adaptable for different configurations of coils, throttle body and intake manifold.
- Completely covered in high-quality woven nylon loom with heat shrink breakouts.
- Every connector lead labeled with permanent white-on-black heat shrink labels for a guess-free installation and professional look.
Harness Length
This harness is offered in two main trunk lengths. The long lead length is approximately 66in from the back of the intake manifold to the NEXUS A connector, and is plenty of length for comfortably mounting the ecu under the passenger seat. The short length is approximately 40in, intended for mounting the ecu on the dash bar of a caged car or in the glove box, without wadding up a bunch of excess length.
Starter
This harness features a starter solenoid lead built-in, fully loomed and labeled. The starter solenoid is mounted directly to the starter motor on Godzilla engines. If swapping into an older Ford chassis that has a solenoid mounted on the fender or firewall, it is not needed and can be removed from the engine bay.
Oil Pressure
This harness is plug-and-play with a factory Ford oil pressure sensor. A 20-22 model year sensor must be used.
I/O Stub & Power Tap
All spare inputs and outputs are wired and terminated to DTM-style connectors, with system 12v and ground, and sensor 5v and ground for hassle-free expansion.
Depending on selections for throttle, oil pump and VCT, additional inputs and outputs will be required to be used.
CAN Bus
This harness features CAN bus connectors for both channel 1 and channel 2, terminated with the same DTM-style connector as Haltech standard.
Front Accessory Stub
One nice feature included in this harness is a built-in accessory stub, terminated with a DT-style connector near the front of the engine. This prevents the installer from having to run additional wires with the engine harness, saving installation time and making a cleaner result. This connector stub features -
- Ignition power through a 470-ohm resistor, to use for alternator exciter.
- Accessory power that can be used for either an electric water pump or a/c compressor. This circuit feeds through the harness back to the power distribution stub.
- Ground terminal feeding through harness to back of cylinder head.
Sensor Tap
This harness features a terminated stub for splitting key sensor signals, if needed for piggybacking with factory controls or other external controllers.
- Crank position
- Cam position
- TPS (TPS-1 if DBW)
Ordering Information - Please Read!
ECU
This harness is available for Haltech NEXUS R3, R5 and S3 series ecu's. Your ecu selection is for our information only.
Wideband O2 Sensor Connector Type
If running a NEXUS R Series VCU, the wideband o2 sensor lead is built-in to the harness, and can be terminated for plug-and-play use for either the Bosch LSU4.9 sensor, or the NTK sensor. Haltech generally recommends the NTK sensor only for heavy methanol applications.
Injector Style
This harness features an injector harness stub, compatible with injector harnesses from Holley. Harness kit includes our Holley EFI-compatible injector harness specific for the Godzilla, based on your choice. If you already have an injector harness from Holley, it can be used with this engine harness, but our injector harness routes much nicer.
Ignition Coil Style
Your selection automatically adds the proper coil sub-harness kit to your cart, to make connections directly to all eight coils.
Factory Godzilla coils have proven to be reliable for big horsepower, much more so than the factory Coyote and Modular coils. 20-22 model year coils are a "dumb" coil, and require external ignitor modules. Please call for further information and to order.
Throttle Body
This harness is highly adaptable and compatible with both cable drive and electronic drive-by-wire throttle bodies, without leaving unused connectors dangling in the engine bay.
We provide an adapter harness to extend out to the throttle body and idle control valve (if applicable). An adapter for your choice of pedal is also included for DBW throttle applications.
MAP Sensor
This harness is offered with a terminated connector for either a SSI transducer style, known best as the 1/8npt cylinder style sensor available from Holley, LowDoller Motorsports or RIFE.
Many aftermarket intake manifolds, including the BTR equalizer and Holley hi ram feature a mounting hole for the Bosch 1BAR and 2.5BAR sensor, commonly found on factory LS3 and LSA applications.
If you plan to use a vacuum line with the ecu's internal MAP sensor, this selection does not matter much.
Oil Pan
The factory Godzilla oil pump is a variable displacement pump, which is regulated by a PWM solenoid in OEM applications. With the solenoid unplugged, or effectively eliminated, oil pump bypasses to full flow, which can result in excess of 140psi. If running a factory oil pump and pan, the factory solenoid must be utilized to regulate oil pressure.
If solenoid is elminated by running an aftermarket pan, or modifying the factory pan, oil pressure must be regulated mechanically. See link to reference diagram below.
Fuse / Relay Center
The inline fuse and relay on an off-the-shelf Holley engine harness always seem to get wadded up way up into the dash, leaving them inaccessible for troubleshooting and diagnosis unless you stand on your head in the passenger's seat and cut 173 zip ties. For this reason, we designed the harness with an external power lead, where injector power, coil power, ecu power, starter solenoid power, fuel pump output and more are terminated with a Deutsch connector for easy hookup in a centralized location to your choice of relay center, or even a PDM like the RacePak SmartWire or ecuMaster PMU.
For a true standalone installation, we offer a basic yet inclusive relay block that includes:
- 40A relay for aux / fans (3x)
- 40A relay for fuel pump
- Starter lead, to connect to starter / neutral safety switch
- Ignition switch lead from both pins A13 and A26, to connect to ignition switch.
- 10ft unterminated flying lead wires for fuel pump, fan and switch activators.