Rogueleader
Bringer Of Rain
- Oct 21, 2009
- 246
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- 16
Forgive if I am misinterpreting this picture, but it appears you have the "ground" from the pickup connected to the "ground" of the jack. This won't do anything, this is also why the hum goes away when you touch the end of the cable connected to the guitar, you are effectively "grounding" the circuit.
What you need to do (as I believed a couple others have mentioned) is solder a wire to the baseplate of the bridge and run it into the cavity. You then need to connect both the ground of the jack and the ground of the pickup to the wire in some manner. Thats all there is to it!
Something else to consider is that if you have already soldered the ground wire to the bridge there is a chance that the finish (black paint) on the bridge is impeding conductivity. I don't honestly know enough about flatmount bridges like that to know for sure, since all my guitars are either TOMs are floyds. The black coating might not be conductive (or you might just have a poor connection somewhere in the circuit), and you might need to scuff it off in a spot to make a proper connection to the metal of the bridge.
Edit: The bare cables are not causing the hum from the evidence you have indicated. The excessive hum you have indicated is certainly from it being ungrounded. Bare cables can certainly exacerbate the problem, but the reason why you don't want to have bare cables like that so close to each other is that if they touch (which is quite possible once you close up the cavity) it will create a short circuit. This would cause the sound to cut in an out, since it would prevent the "hot" signal from reaching the jack.