The ESP Guitar Company

Plug it in to an amp and tap the pole pieces with a little metal object like a screwdriver. If it is working, there should be a "clonk" coming out of each coil.

don't worry about rewiring to test just disconnect the pickup and use a multimeter to see if there is a circuit going through the pickup, depending on the strength of the return signal would give you an output rating. if it deviates a tad bit, you should check the ohm rating and you should see a rating, if so the pickup is perfectly fine, if you have problems with it cutting out then it would be a sign of bad soldering.

^still sounds like the wiring not the pup itself

okay and you should mentioned that you had an EMG earlier, sinse there are internal chips inside that can go bad, i was referring early that it is almost impossible for a passive to go dead, but then again since it is an EMG (even though its still passive) there are other parts inside that can go bad, ruing the pickup.

yup, thats not typical for an EMG though, how long have you had the guitar?