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If you want the lower tone control to work on the bridge pickup as well, connect the empty terminal to the one directly below it, where the wire goes to the lower tone pot.
"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
Don't worry about the grounding plate arrangement or the tone cap, they can stay as they are - it's just the switch that's the problem.
That's a completely different type of switch - don't copy the connections on that, they're in a different order.
The one in the Seymour Duncan diagram is correct for the switch in fretfinder's guitar.
"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
The three white wires carrying the signals from the pickups are fine.
What the tech did wrong was remove a short, insulated jumper wire that connects the two "wiper" contacts on the two poles of the selector switch. (Probably explains the hanging short red wire.) He then ran a jumper wire from the Bridge PU terminal to the second pole of the selector switch and the blue wire from the wiper terminal to the lower tone pot. (In this configuration, it can only work on selector switch positions one and two. B and B+C.)
Really, just undo it all and redo it like the Duncan diagram - it's only eight connections (and one new bit of wire). That's the quickest, easiest and guaranteed to work correctly.
In theory you don't need to move the pickup connections to the other side, but then the blue wire won't reach to the terminal it needs to go to.
"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
https://sixstringsupplies.co.uk/
Our YouTube Channel for handy "How-To" Wiring Tutorials
"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
Which is correct if you prefer a gentler volume taper at the top end.
Aha... looking at it on a bigger screen I can see something - there's a blob of solder that's fallen down onto the switch rotor - you can see it clearly in the third pic. If that's being carried round with the rotor it could be shorting the tone control contacts.
"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
With a single, shared capacitor, the connections to the tone pots have to be exactly as per the diagrams supplied above. i.e. Centre terminal of lower pot, hard wire linked to third terminal of upper tone pot, then, the capacitor grounded to the chassis of the upper tone pot.
In the photographs, the one capacitor is grounded to the shielding plate. By this method, the hard wire link between the two tone controls acts in reverse to the intended use. Instead, the signal for the neck pickup passes through to the lower tone pot.
If the upper tone pot does anything at all, it may act as a volume control on the neck pickup when that is selected.
The only difference between the wiring in the guitar and the Fender scheme is that the capacitor is connected to the other end of the link between the pots. It will work exactly as intended.
The problem is at the switch.
"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