East Coast Supercharging ECS Stage 1 2003+ Fuel System - Manual (Page 7)

Wiring the ECS fuel system is very simple.
Wire the provided 3 wire relay as follows:
Fused Power to 12v power on back of alternator.
Fuel Pump power to non fused red power on relay
Black ground to one side of Hobbs.
Other side of Hobbs to Ground.
Fuel Pump negative to ground.
Follow the diagram below being certain that all connections are to clean ground sources on the frame
and soldering and/or shrink wrapping all connections.