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Re: 5.3 factory harness with carburetor?
Yes, you will need that ground and all the wires marked for the injectors.
I am not sure where you saw the information that they are not needed. I dont see that in that link. I have done a couple of these and probably used that chart as well.
The injector plugs are spread all thru the blue harness.
it states all those not highlighted stay but they are part of the harness so they go to a sensor, the others you will need to hook up to an "external" like ground or positive or brake switch ect...
I always unpin mine rather than cut them.
Good luck
Dave
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Dave
1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap
1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?)
"A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome".
"If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"
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