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You didn't say what make and model of the guitar or the pickup, so this is just a generic answer.
Remove the strings and saddle. center the picup in the bridge slot noting where the wire is located and mark where it needs to exit. drill a hole just large enough for the wire to pass through. Check where you want to install the output jack. If in the side, drill a mounting hole. If you're using an endpin jack, drill the appropriate pass through hole..
place the pickup in the slot pushing the wire though the hole, then out though the ezit hole. press the pick up in place with a q-tip, toothpick or some other nonmetalic probe. re-install the saddle and string the guitar. temporary solder an output jack to the wire and try it out before permenently installing the out put jack as you may need to reposition the pickup right to left in the slot to get the strings balanced. once it sounds right, install the output jack
There are various things that could be causing the hum, best to start out on the smallest thing and go from there, could be dust gettting inside the volume or tone pots, check the ground wire that is soldered under the bridge plate to make sure it has a good solder and is not loose, etc. if all else fails, a quick fix is to place black electrical tape across the pick-ups, this will knock out some of the hum and help ground the instrument somewhat.
several things....First I would check your battery. second, check wiring to your switch to make sure the wiring hasnt come apart from the solder joints. From there I would test your switch itself to make sure it is still good.I have had switches go bad and only have one pickup work before.
If it is the socket on the bass, it should only be 2 wires, on the 2 ears of the socket. He must have soldered it to the wrong place. The wire from the pickup switch(if more than 1) or the volume(if only 1) should go to the part of the socket that touches the tip on the guitar cord when plugged in. The other is ground and connects to the backs of controls and switches throughout the instrument, even to the bridge and tailpiece.
You can try repair it. They are pretty basic. I would look for poor solder connections, and reflowing all solder joints in it would be prudent.
The hum is likely from a gain stage with a bad solder joint on the input isolation capacitor. Also check other wires and check for bad solder connections on the pickup connections as well. It can even pick up hum through a bad shieid/ground connection in the jack on the guitar
If the pickup in the guitar suddenly stops working - then most likely there is a solder connection that has come loose. If you can get a small dental mirror, you may be able to look through the F-Hole on the guitar and spot the loose wire. The tricky part with a Sheraton is the way the hollowbody is constructed doesn't allow you to work on the electronics as easily as say a Fender Strat.
The only way to fix this would be to carefully remove the electronics and re-solder the bad connection. You should only do this if you are very comfortable with soldering.
Since the bridge pickup fails, yet the neck pickup works, you can eliminate about 1/2 of the problem. You can start by examining the wires that come off of the bridge pickup and follow them to the next connection point. You can also test wire continuity if you have a multi-meter to hook up to the wire - to check that the actual wire is not broken in the middle. (Broken wires on the inside of the guitar would be rare - more likely it will be an obvious solder joint that has come loose.)
If you have a local mom and pop music shop nearby - you may be able to take your guitar in for a free diagnostic - but that depends on the shop.
Good luck! Hope my information has helped you figure out a path to get it working again!
The Barcus berry range of transducers is well established and they are good quality.
It depends on what you are doing with your fiddle!
I use a K & K pickup on my double bass and its FANTASTIC.
Check out their violin pickups - their kits is professional quality
Use some fine sandpaper to clean a spot where you want to solder before you do the soldering.
Maybe you will have to use some soldering flux or paste or other like stearine, colophony (rosin) to make the solder stick, but usually if you clean it well with sandpaper and alcohol before soldering, the flux in the soldering wire should make the solder stick well enough, but that varies depending on the material used for the cover of the potentiometer.