I must have lost my mind and not posted for you for 10 DAYS! I posted on other threads, but not yours. Please don't feel slighted by me paying attention to others as well... I thought only my wife was like that! That's why I like my LC! I can look at other LC's and LX's and it doesn't get jealous!
I'll try to do better!!!!!
Door ground wires: The window motors are not grounded back to the door only because the doors do not have a good, clean permanent ground. It MAY ground if all conditions are right through the hinges and latches, but you cannot count on that. I would take a ground all the way from the motor all the way to the switch. That will allow the most clean current flow and one you can count on. My windows run VERY slow and I believe it is partly because I have bad grounding through the switches. That's something I still need to chase. (I hate chasing electrons....)
Fuel pump: Odds are that the black wire is a ground for the fuel pump. It needs to have its own separate ground because it will not ground through the tank body and it helps reduce explosion hazards. Check the EWD.
Another reason Mr. T placed a ground with every electrical component is to reduce radio noise and to not "back-feed" through the grounds. (OK electrical guys....bag on me for this 'cause I may not be right.....)
My God! I am amazed at the levels you are going to on this truck! I hardly have the energy and time to change the OIL!
Keep up the great work!