Right. I forgot it was an '87. okay, do this; Set up just like you did before, with a test light probe touching the 2nd plug from the left, on the bottom row of four, and attach the alligator clip end of the test lamp to the pos battery post. Insert a jumper wire with a blade fitting on one end, into the single wire connector that accompanies the 6 pin plug, and the other end of it should be attached to a good ground, rather than the #2 pin in the 6 pin connector. Understand? next, turn the key ON, and wait for the test lamp to start flashing. If it doesn't, leave everything the way it is, with the key ON, and double check all your connections, and make sure they're good. If you still don't get any kind of flicker from the test lamp, let me know.
Take care,
~Chris
In the "drawing" below, the X is where your test light probe goes, and the pigtail wire (G) goes directly to ground.
/ _ _ \
_ x _ _ |G|
|