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Strange tone problem...

yes , yes .. continuity ... check / touch from one metal part to another ... your meter should read very close to what it does when you touch the meter tips together ... i set my meter on a very low ohms setting ..

sounds like something is Not making good contact , or touching something it shouldn't ..

your cap , with help from the tone knob , bleeds off treble freqs to ground ... at whatever the cap value is .

or ... your bass could be afraid of heights .. !??!
HAHA! Gotta be the heights thing.
 
Its probably just a cold solder joint (check your output jack too when testing), but instead of chasing down ghosts in the electronics, you can take this opportunity to install an Aguilar preamp, Bart pickup, ramp from pickup to bridge, shield your pickup and control cavities, ground your pickup cover, change strings, complete setup, and then put it back on the wall for another 6 months. ;)
 
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I'll fix it for you for free. Send it to me, I'll fix it, and, return it. Of course, part of my standard service is I make sure it's working before I send it back. A decade or two of gigs, just to be certain. I wouldn't want to return it if it isn't gig worthy.
 
Its probably just a cold solder joint (check your output jack too when testing), but instead of chasing down ghosts in the electronics, you can take this opportunity to install an Aguilar preamp, Bart pickup, ramp from pickup to bridge, shield your pickup and control cavities, ground your pickup cover, change strings, complete setup, and then put it back on the wall for another 6 months. ;)
HAHA! Yeah, "hey honey, don't mind the credit card charges... Just giving Gramps (that's it's name) an overhaul to hang him back up!"
 
When metering out the grounds don't forget the ground connection between the pot cans and the control plate. Sometimes corrosion can encroach where they meet.

Spritzing the pots with control cleaner and working the knobs back and forth some might be a good idea.
 
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Before you start ripping wiring harnesses apart, go to Radio Shack and get a can of DeOxit spray. Point the nozzle into an opening in each of the pots and give it a good spray. Rotate the control 20 or 30 times. Let it dry overnight and try the bass. I work on a lot of old stereo equipment and virtually all of the pots don't work right because they have been sitting unused for long periods of time. Your bass looks relatively new but if you live in a moist environment you could be getting oxidation at an earlier stage than is typical.

Rick B.
 
Before you start ripping wiring harnesses apart, go to Radio Shack and get a can of DeOxit spray. Point the nozzle into an opening in each of the pots and give it a good spray. Rotate the control 20 or 30 times. Let it dry overnight and try the bass. I work on a lot of old stereo equipment and virtually all of the pots don't work right because they have been sitting unused for long periods of time. Your bass looks relatively new but if you live in a moist environment you could be getting oxidation at an earlier stage than is typical.

Rick B.
Gotta love da RadShack!:thumbsup:
 
Before you start ripping wiring harnesses apart, go to Radio Shack and get a can of DeOxit spray. Point the nozzle into an opening in each of the pots and give it a good spray. Rotate the control 20 or 30 times. Let it dry overnight and try the bass. I work on a lot of old stereo equipment and virtually all of the pots don't work right because they have been sitting unused for long periods of time. Your bass looks relatively new but if you live in a moist environment you could be getting oxidation at an earlier stage than is typical.

Rick B.
Tried that too.
 
My guess is the pole grounded to the case on the volume pot is loose or disconnected. look at post # 9 the loop of wire you see going between the cap and the arrow ( which represents ground ) on the volume pot has come loose or was never soldered right in the first place. It may not be a wire, just the pole bent and soldered to the case.