I have a 2012 F150 FX4 and I have one terminal on the battery that has a lot of parasitic draw heading down it. But I can't figure out what all of the different + Positive cables are for? One heads to the main fuse box but where do the other two go that have the little fused section going to them. The cable I'm having an issue with bends 90 degrees down right at the corner of the battery. I disconnected this cable and the truck still fires up and seems to function fine so I'm not sure what its powering?

Does anyone have a wiring diagram for the cables at the battery?

 

So in this picture what is the battery wire in the bottom right corner #3 for?

 

The terminal with the parasitic draw is #3, in the bottom right corner. I believe it goes to the alternator. Which tells me that the diode rectifier is probably the issue.

 

Would #4 be the wire that connects the positive terminal of the battery to the starter?

 

Did you look at the cables and see where they go?

 

Yeah, they all get insulated together after a certain point. It was #2.

Had to have only one wire attached to the positive terminal at a time and test the wire end at the starter until I found the one that carried the voltage.

 

A lot of late model vehicles don't shut everything down when you turn off the key.
Some require an hour to complete "housekeeping" and if we happen to measure or notice a drain from that procedure , it could lead us on a wild goose chase.
The general temporary drain is around 50 milliamps ,but can differ for individual vehicles.
When you remove a fuse and see the drain is gone , you have also allowed the system to reset and when you reinstall the fuse , the drain is gone.
Suggest you look for and read up on the correct way to pin down a parasitic drain. (Measure voltage drop across each fuse)