Ok, the way it looks is he's using the 2 terminals to break the ground when its unplugged. It should be breaking the positive instead. Theoretically it shouldn't matter but that might be the problem in some weird way. It looks like he did a good job, very clean and used heat shrink.
Yeah ive been using him for years, great guy which was another reason I was tripping out over this. Sadly he dosen't live close anymore so if there is something simple I could do myself id prefer that