Dakota backup lights switch?

Well, we're getting ready to leave this fair but rainy climate for something a little warmer. Thusly, I had the truck in to have the lights converted back to US standards. Over the last three years, I've
had no backup lights, as they've been rewired to be turn signals - the UK requires white turn signals in back, but oddly does not require backup lights.
I've hated not having those lights, and was looking forward to actually being able to see what I was backing into at night.
But, alas, the mechanic tells me that the lights don't work, and they've traced it to the switch. I, of course, have little idea what he's talking about. Acquiring a part isn't too hard, we'll be back in the USA for a couple months between tours... but, is the switch something I can replace myself? I don't know if Australia requires backup lights or not, but I do want them working ASAP.
So, my question is, where exactly is this switch? Is it user-replaceable? Why did the thing break in the first place? It was explained that the switch would be activated whenever I put the truck in reverse, whether or not it's actually lighting the lamps. Is that true?
Thanks for any help!
jmc
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