On my 2002 2500 there's a couple things I can't seem to figure out what there for. First is under the cowl piece where the wipers fasten on, on the passenger side there is a black rectangular shape box with what appears to be some type of very small hose coming off it, like a vacuum hose. Mines never been hooked to anything and i'm wondering what it's for :shrug:Second, on the headlight wiring harness I have a plug for my headlight bulb, a plug socket for my signal turn bulb and there's another plug connector there not being used...anyone poosibly know what that's for

Not sure on the vacuum line box thing. I am thinking the connector not used on the headlight is for sport headlights? I remember they had 2 filaments or something, and maybe it uses that? Not sure, all I can think of though, I know I have one disconnected too.

I was thinking the sport headlights too but it's a diferent style plug connector than the blue one thats there now for my headlight . I have a buddy (yes, i have a friend ) that has a sport, may take a look at his next time he's around

The box under the cowling is a vacuum reservoir for the HVAC box functions.

Mines got a 4 inch piece of line hangin off it, Is that the way they are suppose to be or i'm wondering if someone cut it off ? Everything seems to be working

Suppose to tee into the HVAC vacuum line going into the dash...