Wiring and ECU Pinning for Electric Fans
At 6:09 in
FACTORY Electric Fan Conversion! Best Mod For 99-04 Silverado/Sierra/Yukon/Tahoe (Free Horsepower!)
What happens here
Install the new factory-style relay box and wiring harness. The relay box should snap directly onto a designated slot in the vehicle's fuse box area. Next, connect the provided ECU pins to the harness. The presenter uses non-insulated crimp connectors and a pair of crimpers, applying them to the wires that will be inserted into the ECU. The green wire typically goes to pin 42 on the blue ECU connector, and the blue wire to pin 33 on the green ECU connector. Use a pick tool, such as a screwdriver or dedicated terminal tool, to carefully open the pin slots on the ECU connectors and insert the newly crimped wires. It is necessary to lightly 'spit' on the pins or use a lubricating agent to help them slide into the tight holes. After inserting, ensure the pins are securely locked in place. The harness also includes power and ground connections; the power tab should be bolted directly to a main power source, and the ground wire to a reliable chassis ground point, preferably a cleaned-up spot on the cylinder head for optimal conductivity.
Goal: Integrate the new electric fan harness into the vehicle's electrical system and ECU.
Tools and materials
- Brake Cleaner — Cleaning ground surface
- Crimp Connectors — Attaching pins to wires
- Crimpers — Crimping connectors to wires
- Drill DeWalt — Enlarging ground bolt hole
- ECU Pins — Connecting fan control wires to the ECU
- Factory-style Wiring Harness — Main electrical component for fans
- Lubricant — Aiding pin insertion into tight slots
- Pick Tool — Opening ECU pin slots
- Vise — Holding the bolt for drilling
- Wire — Connecting to ECU pins
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