What’s burning?

I recently installed Bulldog's RS82 remote start.   I leave the air conditioning controls on so that the truck will be cool, and when I get inside, I detect a faint burning smell. 

I worry about this because I never noticed it before I installed the remote start.

My wiring scheme shows that I have two accessory wires, orange and brown.  If I remember correctly, I used only the orange.  Should I hook up the brown as well?  Or does this even make a difference?

Thanks,

James Ayers

1997 GMC Sierra 1 Ton 4 door crew cab pickup.   I used the method described in the bulldog manual, strip back wires, twist together, tape and wire tie.