Any idea what this wire would be for?
The guy who had it before me had a remote start/car alarm system installed, so I was wondering if that might be part of it??? From everything I've read on the touchiness of the opti harness I'm thinking that isn't a good idea whatever it is going to. My plan is to leave it off for starters and see how it runs and then notice if anything doesn't work.
Here are some pics I took of it:

