Quote Originally Posted by Dikkybee007 View Post
My amp is only about a month old, If I let the magic smoke out I pay for it so will wait until after warranty is up.

If you use shielded wire it will remove the hum introduced by the wire but not any other parts, whereas if you shield the cavities it will remove all or you can do both and be really sure.
A) No risk of damage at all by earthing the guitar lead's ground connection.

B) The ES-3 is a fully hollow-body kit with no control cavities. Even if one were able to get inside and screen the entire body, the two F-holes would still let in a lot of RFI. A Faraday cage is only as effective as its largest gap (which obviously should be very small or non-existent). The length of the F-holes precludes any real shielding. It would have some effect for noise from the rear and sides, but maybe almost none for RFI hitting the front of the guitar. So apart from impracticality, it simply wouldn't be that effective.

The wiring harness in the ES-3 is pretty small, so the only real length of wire that would benefit from braided cable is the output jack connection.

If it were me, I'd probably start again with new pots, and use the volume pot as the 'star' grounding point. So the output wire braid is soldered to the back of the volume pot, the pickup grounds are connected to the back of the volume pot (as they are at present), and the trapeze ground and tone pot ground are also taken from the back of the volume pot. Star-wiring the ground is the best way of wiring up a harness for minimum noise, but it's only really practical on a simple arrangement like you have.