#2 is a ground, you can use any convenient ground (as in the engine block or manifold).

I guess not having the duty cycle meter connected due to having the wire pulled out would work very well.

I don't really want to know why anyone would pull the wires off the diagnostic plug.....

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!