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1999-2006 GM Gen III 4.8/5.3/6.0L EFI Harness Extra Length – Mechanical TB Part No 60218


Engine: 4.8L, 5.3L, 6.0L w/ Mechanical Throttle Body
Trans.: 4L60E, 4L65E, 4L70E, 4L80E, 4L85E, or manual

Number of Circuits: 8 Fuses with Ignition, Fuel Pump & Air Pump Relays
Harness Length: 8 Feet Between Engine and ECM
Fuse Type: Blade
Firewall Passthrough: Grommet
Color Code Based:  1999 C1500 Truck
Circuit Designations: Printed Wire Tags on all Connectors and Open Ended Wires

The Fuse Block Protects The Following Circuits:

  • Air Pump & Air Pump Solenoid
  • Canister Purge, Canister Vent, Transmission, & Park Neutral Position Switch
  • Driver Side Injectors and Coils
  • Dual 40 amp Ignition Relays
  • Fuel Pump
  • Heated O2 Sensors, Mass Airflow Sensor, & Brake Switch
  • Pass Side Injectors and Coils
  • ECM B+ & DLC B+
  • ECM IGN and Malfunction Indicator Lamp

This harness includes connections for the following components:

  • A/C Request
  • Air Pump
  • Air Pump Relay
  • Air Pump Solenoid
  • Alternator
  • Brake Switch
  • Cam Position Sensor
  • Canister Purge
  • Canister Vent
  • Crank Position Sensor
  • Data Link Connector
  • Driver/Pass Front O2 Sensors
  • EGR Valve
  • Engine Coolant Temperature
  • Fan #1 Relay Ground ECM Activation
  • Fan #2 Relay Ground ECM Activation
  • Fuel Pump
  • Fuel Pump Relay
  • Fuel Pump Test
  • Grounds
  • Idle Air Control
  • Ignition Coils
  • Ignition Switch Signal
  • Injectors
  • Input Speed Sensor
  • Knock Sensors
  • Malfunction Indicator Lamp
  • MAP Sensor
  • Mass Airflow Sensor & Intake Air Temperature Sensor
  • Output Speed Sensor
  • Park/Neutral Switch
  • ECM
  • Reverse Lights
  • Starter
  • Starter Relay
  • Tachometer
  • Throttle Position Sensor
  • Transmission
  • VSS Output for Speedometer


For complete factory emissions control purchase optional 60323 emissions harness to connect Bank 1 & 2 Rear O2 and Fuel Tank Pressure Sensor.

Painless Part Number: 60218 Category: Tags: , , , , , , , , , , , , , , , , , , Product ID: 21172


This harness is standalone and is not intended to replace the OEM engine wiring.  Standalone harnesses are intended to run the designated engine & transmission only, generally when swapped into another vehicle.  

Painless LS swap wiring harnesses make getting your engine swap wired a simple task!

This harness is designed for the 1999-2006 4.8L, 5.3L, 6.0L mechanical throttle body engines using an LS1 / LS6 PCM with a 4L60E, 4L65E, 4L70E, 4L80E, 4L85E,or manual transmission. 2003-2006 Engines will require a mechanical throttle body to be installed. 2003-2006 engines which were originally flex fuel will also require Delphi Multec 2 (factory truck style) injectors to be installed. Harnesses do not include connections for the rear O2 sensors or fuel tank pressure sensors but are available separately. Included with this harness is a 10-circuit weatherproof fuse block and GM color-coded wires with labels for easy installation.

This extended-length harness allows eight feet from the back of the intake manifold to where the fuse block and ECM mount. Perfect for those who plan to mount these components under the seat or in the center console.

This kit includes:

  • All new fuel injection harnesses with OEM fitment connectors and harness breakouts
  • OBDII connector, mounting bracket and check engine light
  • Rubber grommet
  • Mounting hardware

**Please note that this harness does not support Flex Fuel USCAR Injectors.**

We recommend checking the online manual for the full list of required mating parts prior to ordering.


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