12.0 ELECTRICAL CONNECTIONS
The cable assembly plugs into the ECU and also connects to the throttle body, fuel pump, sensors, electrical power, and ground.
Apply a small amount of dielectric grease to all electrical terminals and connections.
WARNING! Keep all wires away from hot or moving parts as much as possible. Your kit includes cable ties to secure
wires clear. Bare or frayed wires can result in electrical short circuits, which can cause system failure.
Start with the bundle containing the three-way male connector and the black and brown wires. See Figure 9. Plug the three-way
connector with the grey, blue and black wires into the throttle position sensor on the TBI until it locks in place. The black wire
with the ring terminal must be secured to an engine block or intake manifold bolt. Be sure the connection is free from rust dirt or
paint. Next connect the brown wire to the temperature sensor. The pink wire must go to ground. The voltage on this terminal
must be zero when the engine is off or running.
NOTE:
Good grounding is essential to make this system operate correctly.
The other bundle in the harness contains the four-way connector with two red wires, a violet wire, and a orange wire. Plug this
four-way connector and push this into the fuel pump until it is secure. The single black wire with a ring terminal is the ground.
Bolt this to the engine just as you did with the previous black wire. The white wire with the ring terminal is the tach signal input
to the ECU. This wire is usually connected to the (-) side of the ignition coil. If hooking up to a GM HEI ignition, a 1/4" female
terminal will have to be used in place of the ring terminal before connecting to the tack output on the distributor cap. If an
aftermarket ignition is used and has a jack labeled "tach signal" or similar, connect the white wire to this point. The last wire to
connect is the red wire with the fuse holder. This is the main power lead for the system and must be wired to a source that is
energized during the on and crank positions of the ignition switch. Reconnect the battery momentarily and use a voltmeter to
find this. Be sure to disconnect the battery after a suitable power source is located. The harness is designed to directly hook up
to the IGN terminal of a GM HEI distributor. See Figure 10. For other types of ignition systems, power must be found
elsewhere. In this case, trim the fuse holder cable as shown in Figure 11. In some cases, a wire must be run from the boat
ignition switch back to the fuse holder on the harness. Use 14 gauge wire or larger if this is done.
Figure 10
Figure 11
