If I remember correctly, the air pump was the black one to the right in the picture above. I couldn't see where it came from or went to when I was replacing my vacuum hoses, I just noticed it wasn't plugged up when I took everything off.

 

there is a ground on the airpump, and then the grey electrical connecter

 

So it's the ground??? Maybe I'm thinking of something else, but I had my airpump off and underneath it (but not part of the airpump) there was a connection that wasn't hooked up because one end was broke. I was going to plug it up but I didn't know which of the two wires went where and didn't want to hook it up backwards.... I'll have to go look again and take some pics I guess.

 

if it was the grey connecter...then its for the airpump. the other black wier near the airpump is a ground i *think*