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In the words of Edwyn Collins, "rip it up and start again."
I suspect that there is some ugly shit lurking underneath the capacitors.
What pickups are in the guitar now? Soapbar P90s, humbucker-sized P90s, covered humbuckers or open bobbin humbuckers?
It's also possible that the strings aren't grounded - does the buzz stop when touching the strings?
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Regardless of the plastic cover, do the P90s have a metal base?
No hum when I touch the strings or bridge, will look under the tape but the wiring diagram online only shows two wires from the pickup.
The dangling white wire is because it looks as though the previous owner had only 2 core wire to hand (the blue earth wire)...
Thanks again
Most of the soldering on display is completely unnecessary.
When changing from humbuckers to HB-sized P90s, the only solder joints that need work are the inputs to the volume pots and the ground connections. In an ideal world, the metal covered P90s would have 2-conductor + shield output cable - enabling phase reversal.
My guess is that the previous owner has attempted the "Fifties Wiring" mod and a snake oil capacitor upgrade.
Firstly it is not hum, it’s buzz - they’re different-sounding and have different causes. Secondly it’s not caused by anything to do with earthing. Earth loops - which produce hum - occur between two pieces of mains-powered equipment.
It’s actually buzz being picked up by lack of, or incorrect, shielding or grounding.
Sorry for the pedantry - it’s just that it’s often easier to solve a problem if you describe it correctly .
The very first thing to do is remove that mess of tape and see what’s under there, it may explain everything at one go.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein