Tailights (Specifically the inner ones)
 

My friend and I noticed that the Alero has two filaments in the inner tailights and yet they only light up when the headlights are turned on. Is there any other purpose to the other filament in the tailight?

no but if you wanted to run a wire from your center light down to each inner tail light to the socket that has no wire going in to it you can have all your brakelights turn on when you brake....

Thanks for the quick reply :).

The other filament would've been used on export cars with rear fog light(s). That and that they don't make that size bulb with a single low-intensity filament.

and mine are so bright at night that the people behind me i can see everyhting their doin in my rear view as long as its not in a truck or van that sit up really high.. but i tap my breaks and their faces just light up hahahahaha