Overview
The Wicked Wrench Pro-Series Gen V Standalone Harness is a premium, American-made wiring solution embedded with advanced modern vehicle integration. Our specialized Pro-Series CAN Bus Module accurately replicates factory GM Body Control Module (BCM) signaling. This architecture makes it effortless to integrate high-end, modern electronic capabilities straight into your classic muscle car or truck chassis swap.
The integrated CAN Bus engine management infrastructure grants your custom swap vehicle maximum drivetrain functionality:
- PWM Alternator Control: Full pulse-width modulation regulation maintains a precise, stable 14.4-volt charge to prevent low voltage drop issues.
- Tap Shift Functionality: Delivers instant, full manual electronic gear control capabilities.
- A/C Safety Logic: Features built-in smart compressor safety cut-offs driven by engine RPM, Throttle Position Sensor (TPS), and line pressure metrics.
- Tow/Haul Mode: Unlocks optimal heavy-load shift mapping parameters.
- Park-Neutral Safety: Integrated starter lockout controls protect your vehicle from starting in gear.
- Reverse Signal Circuit: Activates chassis backup illumination lines and triggers electronic camera inputs.
- Dedicated RPM Output: Clean 12V tachometer drive signal pushing exactly 2 pulses per engine revolution.
- VSS Output Signal: Digital Vehicle Speed Sensor output generating standard 4,000 pulses per mile.
- LED Diagnostic Dash Indicators: Pinouts included for dedicated Tow/Haul mode and Tap Shift dash illumination.
Critical Pre-Installation Safety Directives
- One-Piece Build Structure: The main engine loom forms a permanent, single-piece assembly integrated directly with the fuse block.
- Firewall Routing Method: If you intend to mount the main fuse center and vehicle electronics inside the passenger cabin, the assembly must be front-fed through your bulkhead from the interior compartment, feeding the engine-side connectors through the firewall opening first.
- Ground and Power Warning: Verify all terminal points carefully. Inverting power and ground distributions will cause catastrophic damage to the harness and vehicle electronic modules. CRITICAL NOTE: Do not guess wire functions based on appearance alone; not all black split-loom covered circuits are electrical grounds.
- PCM/ECM Tuning Clarification: The baseline computer flash parameters provided are intended ONLY as a reliable baseline startup map. It is engineered purely to override factory vehicle anti-theft systems (VATS) and clear core emissions diagnostic fault protocols to let the vehicle fire up safely. Full performance EFI calibration and dyno operations must be completed independently at an authorized engine tuning facility.
Power Distribution and Grounding Architecture
1. Main Positive Electrical Distribution
Connect a heavy-gauge positive battery cable directly from your positive battery terminal down to the main starter solenoid power stud (the larger, outside threaded post on the starter motor casing). A high-current power distribution block may be placed inline to smoothly feed high-amperage current split lines outward to your chassis fuse panel or main vehicle accessories.
2. Engine Block and Chassis Ground System
Ensure the primary vehicle battery ground leads carry a clean, uninterrupted path to both the vehicle chassis and the main engine block casing. We strongly recommend using high-quality grounding wire links sized no smaller than 4 AWG for all battery, block, or frame connection pads. Every engine block grounding face must be scrubbed completely bare—free of any oil, rust, clear coats, or automotive paint. Keep all primary chassis grounding lead paths short, ideally measuring under 20 inches total length.
Harness Component Identification Breakdowns
Section A: Powertrain Control Module (PCM) and Distribution Block
Locate the main vehicle management hub area to correctly mount the diagnostic components, system relays, and air conditioning interface sub-looms.
Section B: Central Drivetrain Loom Run
This branch forms the spine of your top-end block wiring. Lay this segment smoothly along the engine valley area to address your ignition system coils, starter command triggers, and alternator regulator hookups.
Section C: Front Accessory and Sensor Termination Group
Route these forward lines cleanly around the intake assembly to line up with your mass airflow sensors, throttle bodies, oil pressure sensors, and camshaft positioning components.
Section D: Modular Transmission Sub-Harness Connections
Plug your specific transmission expansion harness into the main engine trunk line. Route the sealed case plug directly down to the primary connector located explicitly on the right-hand (passenger) side of your transmission housing.
Section E: Independent Climate Control Sub-Harness
This isolated routing line manages your air conditioning integration, tying your independent pressure monitoring plugs directly down to air conditioning system compressor connectors A and B.
Section F: Standalone Universal Chassis Interface Core
This standalone sub-assembly breaks out your system diagnostic inputs. Mount this safely in an accessible position to utilize your OBD-II port, track your integrated diagnostic troubleshooting status LEDs, and tap your pedal line links.
Section G: Electronic Drive-By-Wire (DBW) Throttle Pedal Configurations
Your harness features the exact pedal wiring connector chosen at checkout. Safely anchor your assembly into position to support either your factory Corvette/Camaro assemblies or modern truck foot controls.
Dedicated Fuse Box Legend
The integrated, weather-sealed main fuse center utilizes the following circuit-protected assignments:
- Blank / Open Accessory Option
- A/C Compressor Clutch Relay
- Fuel Pump Relay Control Circuit
- Transmission Control Module (TCM) Power
- Engine Control Unit (ECU/ECM) Main Power
- Ignition Coil Bank 1 (Cylinders 1, 3, 5, 7)
- Ignition Coil Bank 2 (Cylinders 2, 4, 6, 8)
- Variable Oil Pump Control and Bank 2 Oxygen (O2) Sensors
- Bank 1 Oxygen (O2) Sensors and Mass Airflow (MAF) Sensor
- Main ECU Ignition Switching Power
- Inline Red Fuse Link A: Dedicated, unswitched constant battery connection for TCM memory protection.
- Inline Red Fuse Link B: Dedicated, unswitched constant battery connection for ECU/ECM memory protection.
Flying Leads Chassis Connection Matrix
These un-terminated wiring extensions bridge your standalone engine loom smoothly into your classic vehicle's underlying body wiring:
- Switched Ignition Input (Pink/Black Wire): Connect directly to your vehicle's mechanical ignition switch. This terminal must supply a constant, uninterrupted 12V current when the key is resting in the "IGNITION" position AND while actively cranking the starter motor. THIS IS A CRITICAL IGNITION PATHWAY CONNECTION.
- Start Command Input (Black Wire): Wire directly to your ignition switch's dedicated crank terminal. This line must register a hot 12V feed only when the ignition key is explicitly turned to the spring-loaded "CRANK" position.
- Check Engine Light Output (Brown/White Wire): Provides a direct Malfunction Indicator Light (MIL) control output. Functions as a switched ground trigger, pulling down to structural ground whenever the engine computer commands the Check Engine Light to illuminate.
- Reverse Gear Output (Green Wire): Switched 12V output signal triggered when reverse gear engages. YOU MUST RUN THIS CIRCUIT THROUGH AN EXTERNAL RELAY before feeding your vehicle's backup tail lamps or rear view camera triggers.
- Tow/Haul Input (Blue/Yellow Wire): Connect to a standard momentary toggle or button to trigger the internal Tow/Haul performance shifting map.
- Digital Speedometer Output (Green/White Wire): Sends a clean digital vehicle speed signal pumping a standard 4,000 pulses per mile to drive aftermarket electronic speedometer gauges.
- Tachometer Engine Speed Output (White Wire): Supplies a 12V square-wave engine RPM data feed pushing exactly 2 pulses per engine revolution.
- A/C Request Input (White/Blue Wire): Connect to your classic climate control panel fan switch. Requires a positive 12V input signal to notify the powertrain module that air conditioning cooling has been selected.
- Standard Fuel Pump Control (Green Wire): Power drive line controlled directly by the engine computer. Run this green line straight to your frame or tank fuel pump positive (+) power post. NOTE: Do not use this circuit to power high-draw performance pumps demanding more than 15 Amps without installing a secondary high-amp isolation relay circuit.
- Brake Switch Safety Input (Blue Wire): Essential for automatic transmission vehicles and torque converter clutch release operations. Must receive a solid 12V positive signal from your brake pedal switch the instant the brake pedal is depressed.
- Tap Shift Up Trigger (Blue/Green Wire): Connect to your steering wheel paddle shifter or shifter button switch. Operates via momentary ground contact pulse signals.
- Tap Shift Down Trigger (Blue/Red Wire): Connect to your steering wheel paddle shifter or shifter button switch. Operates via momentary ground contact pulse signals.