#1
I have a dean stealth that I recently changed the pots and both pickups on and it worked fine for a couple of hours but I plugged it in later on and the bridge pickup output was cut in half and the neck pickup doesnt work at all. Whats going on with it?
#2
I think you've answered your own question. It's most likely the switch, especially if the neck pickup is still working fine.

Spray some deoxit on the contacts of the switch. Check to make sure the switch contacts are making a good connection with one another too as the tabs tend to spread apart after lots of use and occasionally need straightening. Most 3 way switches are put together with 2 screws and are designed to be relatively easy to take apart for this very purpose.
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I also have to do that. Cottaging this weekend