weird pickup dilemma on my 1974 mark 1 88 key

[Adam91294]

So this is a second hand Rhodes and it's in ok condition not terrible not great either but the biggest problem I am having is getting the volume even. Only 3 or so of my pickups actually make the loud clunk noise there supposed to when using the screwdriver test. However I don't believe all 84 of my other pickups are dead because they all make clicking noises when tapped. Anyways My question is is there a way to salvage these pickups that have some volume( about half the volume of the healthy pickups). Alternatively the quiet pickups sound ok when boosted but create inconsistency in volume because the healthy pickups become super loud.
Here's some pics the pickups are a little rusty but still click...

http://m.imgur.com/a/0NHK6


Thanks for your time,
Adam

[Student Rhodes]

The surface rust isn't your problem.  There's got to be some continuity issues going on.
My 2 cents.

[goldphinga]

Make up a jumper wire with wire and aligator clips. Start at the bottom and jump pickups out of the circuit until you find the culprits.

[Ben Bove]

The pickup wiring from each terminal isn't factory - the wiring from "metal tab to metal tab" has been replaced throughout the piano.  Originally, it was a braided wire where this looks like some kind of solid wire, which may make it difficult to adjust the pickups forward and backward without causing breaks.

Suffice it to say, the problem will almost definitely lie with making sure the pickups are all wired correctly according to the pickup wiring diagram (the right number of pickups actually wired together correctly), or perhaps a bad solder contact on one of the offending pickups.

There is definitely no way you've got a piano of individually dead pickups - this is a good vintage of coil wiring, so it's just got to be some continuity / terminal wiring.

[Adam91294]

Hey guys, so I went and bought some good quality pickup wire and solder and rewired the piano to sets of four and three which improved the upper register although it's not the conventional wiring. However there is a stark contrast between 4 pickups and the rest of the pickups. I posted a video to show what I was hearing and seeing. Could these pickups be dead...

https://m.youtube.com/watch?v=r6giV-ArhPI
Shows the contrast in sound

Part 2 is tapping on pickups that produce the quieter level or average level in my case they do make a small clicking noise
https://m.youtube.com/watch?v=NAchXd2K2iU

[Ben Bove]

They all appear to be working, I believe it just may be that they're out of alignment - meaning that Ab pick up is REALLY close to the tine, producing the loudness where the other notes don't have their pickups close enough, and therefore the volume / bark is much less.

You can see this by eyeballing it as well - see how close the distance is between the end of the tine and the front of the pickup magnet.  I would attempt to back off the Ab pickup a bit, and move some of the other notes closer.

When a pickup is dead, the note is almost inaudible completely.  They're all sounding off in this case.