Overview

Products that can use this harness

• Mercury and Mercury2

History

• This old-style Level 1 harness was part of the economy series for Mercury and some people still prefer them today to save on expenses. The harness contains most ECU connections from the 12-Way Connector for most engine combinations. It does not have the CAM1 and CAM2 wires required for VVTI sensors.
• It has Crank TDC and CAM Home signals which are required for Full Sequential features.

Design Points to take Notice of.

• Crank and Cam sensor wires are in separate shields. Each has its own power and earth wires. This is suitable for systems where the sensors are far apart.
• TPS, Air and Water sensors also share a shielded wire. Take the shielded part as close to the sensors as possible. They share common earth wires. Solder these connections and insolate them properly.
• All the input wires are shielded and are earthed on the ECU side with the small black lead that must be connected to the ECU earth. Never connect a shield on the engine or chassis of the car.

Wire Names and connections on this harness:

Crank (Shielded) contains:

• Crank Sensor (Blue)
• +12V Ignition (Red)
• Earth (Black)

TDC (Shielded) contains:

• Cam Sensor (Blue)
• +12V Ignition (Red)
• Earth (Black)

Map (Shielded)

• Map Sensor (Blue)
• +5V (Red)
• Earth (Black)

Engine (Shielded)

• Water Temperature Sensor (Green)
• Air Temperature Sensor (Yellow)
• TPS Sensor (Blue)
• +5V (Red)
• Earth (Black)
• Earth (White)

Lambda (Shielded)

• Lambda Sensor (Red)
• Earth (Blue)

Ignition Power (Orange)

TPS Output signal for TCU or other systems (Yellow)

Earth Wire for Screens and sensors (Black)

See the design drawing for thickness and lengths of wires. See the connection drawings in the specific product manual on how to connect the harness to each item it was designed for.

NB! Wires that are not connected must be isolated to prevent shorts or interference.