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Understanding Guitar Wiring
Grounding and Shielding
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Shielding eliminates virtually all unwanted interference
and hum. In order for shielding to work, must be in contact
with ground. There are several ways to apply a ground
to a shielding network; when using copper shielding foil,
the ground wire can be soldered directly to it. If your
volume pot housing is in contact with the foil, a ground
jumper to the foil is not necessary. #0029 Shielding paint
is also good for shielding control cavities, pickup routs,
and drilled holes. The paint is very easy to apply in
small tight areas, unlike self-adhesive foils.
To apply ground to a painted cavity, or to a conductive
adhesive foil (aluminum or copper) on a Stratocaster®
for example, is very simple. Bring the paint or foil over
the top of the body in the area that will be under the
pickguard, and around the pickguard screw below the bottom
tone pot. The foil on the pickguard should surround this
screw hole, so that when the pickguard is screwed into
place, the grounded foil on the pickguard will come in
contact with the cavity shielding. The same technique
will work for a Telecaster® control plate/control
cavity and a Stratocaster jack plate/jack cavity.
Another method is the use of a solder lug screwed into
the cavity's side wall. Make the solder lug out of a scrap
of brass and use a small wood screw to affix it. Just
solder a wire from the volume pot's casing to this lug
for a good ground.
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