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Is the fuel pump relay clicking under your finger when you are turning the key to the run position?
Is there power coming in and going out at the inertia switch when testing within the first 5 seconds of the key being turned from off to the run position?
If you unplug the inertia switch and do the test again on the dark green/ yellow wire do you get full voltage then?
Your going to need a volt meter to accurately test this. A test light is not going to do it. You have power right before the fuel pump but the light is dim so we do not know if the pump is trying to use that power and the circuit is low on amps or the circuit is low on amps prior to even getting to the pump. So far its looking like a wire thats faulty and has resistance or the pump has a poor ground. Use the diagram below if needed
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ok so i mixed up my engines... its a 8 cylnder, and when we unplugged the inertia switch and tested the green wire with a volt meetr while turning the key on for 5 seconds we only got 7 volts
The engine does not matter, I knew what you meant since the 4.6 is the only option.
Okay check the fuse that powers the switch side of the relay before and during this same test with the inertia switch unplugged. We need to see where your losing 5 volts with nothing on the circuit even being used.