Fuel pump wiring

A previous owner "installed" a light switch for the fuel pump and then wrapped the wire for that around the positive post on the battery. I have figured out the original wiring and am in the process of puting it back corrrectly. The pump is aftermarket, but appears to be fine. Will post a before and after shot shortly.

Update: OK, I wired in what I thought was the correct wire (white) for the fuel pump. No pumping when key is on (or off, which the last part is good). I am currently trying to locate the interia switch which the elusive white wire is hooked to.
Here is a shot of me and the old light switch used to turn on the fuel pump. The MG shirt I am wearing makes me a better MG mechanic. Maybe I need a hat. Oh well.

So after many failed attempts at trying to find the magic white wire for the fuel pump, I decided to run a new wire. Slats from my car club talked about the fuse block, and after looking at University Motors' videos on You tube, I figured I could wire into the #3 fuse on the box. After a bit of work and snaking the wire, the fuel pump now works when the key is in the correct position. Thank you Slats and John Twist!