Joe H, you are correct. The purple ignition wire runs from S terminal to ignition switch.
The power wire I ran to coil is directly routed to coil and is getting 12+ volts. I brought this up previously to show I had 12v there.
What makes sense to me, is the truck will start with screwdriver 'cause I'm applying direct battery juice to the S terminal. There's no doubt about that voltage. When cranking the other day, I had 9.9 at S terminal. Apply a little more juice, in this case with a screwdriver and it starts.
I ordered a new engine harness last night. Maybe some of that corrosion crept up the wiring and is causing voltage drop. Perhaps just cleaning the plug and repairing wiring was not enough in this case.
-David
Just had a thought. What if while I'm waiting for the new harness to arrive, I run a new wire from ignition switch to S terminal and check voltage? If voltage increases, I know that was problem. If it doesn't increase, I go get a sledge hammer and beat something to a pulp!
