Originally Posted by cnynrnnr

mno221,
Two ground wires are bolted to the back of the plenum (top center rear of engine, under the wiper box). Requires a 10MM wrench and agile hands. Reach between the plenum and wiper box (while engine is cool) and you can feel the grounds. They are bolted tight to the plenum, finger length distance from the top.
It's a bit of work, but you could pull the hood and wiper box out; then you can actually see the grounds and connection.