OK, found the photo, it was lurking in
@oding 's 60 renovation thread at post #435,
here.
For those too lazy to go all the way to the Philippines, here it is...
Rather ashamed at how dirty the truck was in this pic
I mounted it away from the leg so I can get my hands to it. It's under the rack, and behind the leg, so it's well protected from tree branches and the like.
It's been in place for about 3 years now, so it's stood the test of time. Not only is it waterproof, but I loaded it with grease inside, so there's no corrosion in there (I've looked

).
Apologies for the pink cable strap holding the waterproof junction box on to the rack leg. It's the only one we could find in that size and when I fitted it I swore I'd replace it quickly, but it's still there...
It carries power to the front and rear LED light bars, so no massive power loading.