The wires for the bulbs are labeled. 1,3,4,5,6. (there is not a number 2).
I verified that all these are plugged in correctly.

If I disconnect the glow plug, and pull the bulb out, I can put a test light into the connector, turn on the key. The test light lights up, for a few moments, just like the bulb would if it is plugged in. I took a ground wire and connected to the body, and also to the ground tab on the connector, (thinking it was a bad ground), but it still doesn't work.
I reconnected, everything back up, and still doesn't work.