These wires supply the high current earth for the output drives. Since these wire will carry substantial currents, ensure they are well terminated to a clean earth point on the engine block. It is also essential that there is a good clean connection between the engine block and battery negative terminal.
IMPORTANT! |
The Power Grounds MUST be run as SEPARATE wires. DO NOT be tempted to join them together at the ECU and run as a single wire. Also beware of poor earth points around the engine. Some manifolds and other attaching parts may be rubber mounted and therefore have poor earth bonding. A good rule of thumb is to use the engine BLOCK or HEAD rather than attaching parts. |