Paolo's GR 1SF build

[Andy40]

I doubt its the pick ups at all. just check the resistance of them with your multimeter. I assume that you haven't got the ground and hot wires mixed around in one or both pickups? That wouldn't cause a grounding issue but it would cause some hum.

It looks like there only one wire going to the jack? or is there two encased in heatshrink? If so, that would mean you have the earth wire running from the master tone to the jack instead of the earth coming bridge volume pot. I suppose it shouldn't matter (if everything is grounded well) but do you have complete earth continuity between the ground lug on the jack and the back of each pot and the earth lug on the switch?

The solder joint on the earth lug on the bridge volume pot could be a little bit better. It may be fine now but could cause problems down the track in a hollowbody.

Sorry thats all I can see mate.

[Alexis]

Just in case: if you use a fluorescent lamp close to the circuit, it can add a lot of hum. It happened to me several times, until I remember to turn it off when I am testing the guitar circuit.

[Paolo]

Thanks Simon, Andy and all for great advice,
I went back very slowly and methodically again. Re soldering, and checking wires where braided earth may have touched wires.
Installed in the body a couple of times before it was good. But am pretty happy with it now.

I have a new problem. Everything is together, I made a custom made pickguard, neck glued in and strings on.
It sounds horrible! I think problem is the nut is way too high. Open chords are out of tune. It is much higher than both my other guitars.
So the action at the 1st fret is over 1.5mm on high e and 2mm on bass E. See pics.
Looks like it's glued in wrong. What do you think?
Do I have to file it all down?