Hello and welcome to Just answer.com, Super mechanic here. Please DON’T hit accept until you are completely satisfied with the answer. If you need any more on it just let me know. About your vehicle.
Yes, there are 2 wires that go to the "BAT" terminal at the back of the alternator, (fat terminal) and sometimes they will seem to spark a lot when hooking the battery back up. That could be the memories in the various modules. However, to be sure would may want to hook up a test light, (or an amp meter) to see that the draw goes away, or the light does go out after a few seconds.
The light would get connected between the battery and the cable, (negative side) and if the light doesn't go out then you will want to take each fuse out one at a time until it does go out. That would be the circuit with the draw on it.
That is all the information that I have on it, but wait there may be another expert who has more. I will opt out and open it back up. Please don’t reply to this post as that will lock the question back to me, someone should be along shortly, I’m sure, thanks and sorry I wasn’t able to help with it.