Ghost notes.... grounding issue?

[RyanConger]

I am wrapping up a B3 restoration and I am encountering a very strange. Ghost note/ grounding issue. The issue is global affecting both manuals in any preset including drawbar presets. When I play 1 note at a time, the sound is full and perfect. When I play any 2 notes that are part of the harmonic sequence a ghost note appears. (For example, if I play any 2 notes 3 octaves apart on the same manual with just the 16' drawbar pulled out all the way it sounds like the 2' drawbar is slightly pulled out- take off one note and the overtone goes away. If I play 2 notes 4 octaves apart its sounds like the 1' drawbar has been pulled out. If I play octave and 5th combinations then the 5th overtone drawbars sound) The ghost notes are 100% predictable every time and they follow the harmonic sequence of the drawbars and are triggered by key combinations in that sequence (hopefully this makes sense).

I'm pretty sure its a grounding issue, but where do I start? I've visually inspected the TWG grounds and the preset panel. Could this be caused by zinc dendrite build up?

A tech that I'm working with recommended removing 1 preset panel wire at a time, testing its resistance to ground and then zapping it with 9V if it was out of spec. I tried this for a while but I noticed that about 3/4s of the preset wires had a resistance in the 100s of ohms range. Zapping would get them back into the Mega ohm range but I noticed that after zapping a few that the ones that I had "fixed" had returned to their original resistance. It was like playing whack-a-mole with resistance and zapping. After doing the entire lower preset section I noticed no difference and I am, in the back of my mind, wondering if this might be causing damage at the worst and just wasting time at the best.

Any ideas?

[jdoc]

was this a recap of the generator? Could be something in the filtering?

[Sweet Pete]

Are the preset panels fastened to the manuals correctly?
Are the six fasteners that hold down the TWG filter tray tight?
Three along the front lip, three along the back should be tight.

[JoeyB3]

I experienced a similar (though not exact) phenomenon when I restored my B3. It was a grounding issue...the drawbar assembly was not tightened down enough to the top shelf.

[RyanConger]

I haven't touched the generator except to free a stuck tone wheel and the gear on the run shaft (which were frozen). Its a 1971 with red mylar caps so I'm assuming that they're all still good.