#1
Installed a JB and a 59 in an epiphone les paul special ii. Let me say that if the control compartment in that thing was any smaller I would have needed a microscope to find it. Anyhow, the 59 works great. Sounds awesome. The JB worked for 20 minutes until I shifted the wiring a little bit to wrap a short circuit in electrical tape, and now the sound is either extremely weak or nonexistent until I touch something metal like the pickup cover or the selector switch. It seemed like a ground issue but I reconnected the ground from the pickup and it still won't work. I don't own a multimeter and I'm running out of ideas here. I emailed Seymour Duncan customer support with my problem but I don't expect a reply from them until Monday, which is when I need this guitar for a concert. Worst case I'll break out the old stratocaster but it might not sound as good for what I'm doing.
#2
You may have an open ground connection. Carefully retrace all your wiring and make sure it is correct and that your solder joints are good. That's about all I can tell you now, other than you should invest in a decent mutimeter. 20 bucks at Walmart.