In his case the ECU power supply relay isn't clicking on when the key is
turned on. That is upstream of anything internal to the FI harness. He
needs to fix the power relay symptom first.

With the key on, check for 12 volts at ignition coil terminal 15 where
the small black wires attach. If key on power is getting to the coil
terminal 15 then make sure the black/white is plugged in there well and
in good condition. Maybe pull it off and put it back, checking for
breaks inside the insulation near the end. If still no relay clicking
with key on/off, pull the ECU relay and check for 12 volts on empty
socket pin 85. If power is there, measure again but between empty pins
85 and 86. No power at that point would point to a missing ground on a
brown wire at the left cylinderhead, where several brown ground wires
are supposed to be attached to the head by a small bolt. Did you attach
those brown wires there and also attach the ground braid that runs from
there over to the body sheet metal near the coil?

Mark

> Jess, I have been running into issues with the digijet fuel injection
> harness lately in which the problems are caused by the harness itself
> breaking down over time. In other words, connections inside the harness
> are going bad with age and cause this different issues.