I sold my jazz bass and bought a used EB HH Stingray, its output was almost lower than a passive p bass.
Question one:
When i removed the cover to look inside the active circuit, i saw this loose wire in the photo, its tip was in one of the screw holes, but it wasnt connected anywhere? Can anyone tell me whats this wire for? Is it normal that its disconnected and loose like that? And is it normal to have an output like a passive bass?
Question two:
Also the neck humbucker is significantly have lower output, when i put the switch all the way down to bridge and touch to the poles of neck humbucker with a metal tool, there is still current on the neck humbucker. Isnt it supposed to cut the current at neck magnets when its switched to the bridge humbucker all the way down?
I put a brand new battery by the way.
If something wrong i will bring it to the shop and ask for my money back. I can take additional photos if its needed. by the way.
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From what little I can see, and the fact that you only changed 1 battery, not 2, I don't think you have a "Special", but a pre-2018 Stingray.
You're better off asking on the regular Stingray thread, as the preamps are completely different between the two models, and I'm not personally au fait with the wiring of the later 3 band preamps.
Usually the bare earth / ground wire goes from the control cavity, through a small hole, and comes out underneath the bridge, which it sits in contact with.
It appears that for some reason, somebody has modified it, and it's just in contact with the control plate, and the screw into the wood - which I don't think would allow it to serve it's intended purpose.
But you really need to have someone look at this, starting with the folks on the regular Stingray thread.
Regarding low output :
It could be an issue, if someone has been monkeying around with the electronics...
But the pre-2018 Stingray never did have a particularly hot output, by active bass standards, and I've found plenty of vintage passive instruments, with beefy pickups, that are louder.
Try this :
With just the bridge pickup, turn the volume, bass, and treble fully up to 100% (leave the mid at the centre detent).
That should give you a level that is about the same as, or slightly louder than your Jazz bass.
Now turn the mid up fully to 100%.
That should make the output significantly louder than your Jazz.
Report back in the regular Stingray thread, as this one is for the 2018 and later Stingray revision, known as the "Stingray Special".
Good luck!