Mitchel mb200 bass wiring help

[jefflaserfist]

My nephew got a mitchel mb200 bass and it keeps draining the battery when not plugged in. I opened the cavity and the barrel Jack only has 2 wires soldered to it, shouldn’t there be a third to ground it?

 

[Matt Liebenau]

Where does the black wire from the battery connect to?

 

[LoveThatBass]

View attachment 4928386 My nephew got a mitchel mb200 bass and it keeps draining the battery when not plugged in. I opened the cavity and the barrel Jack only has 2 wires soldered to it, shouldn’t there be a third to ground it?

Tip is signal, Ring common to Battery (-) Sleeve ground

 

[jefflaserfist]

The black wire from the battery goes to the pot with the m on it

 

[jefflaserfist]

It doesn’t go anywhere after that

 

[Matt Liebenau]

View attachment 4929351 The black wire from the battery goes to the pot with the m on it

The black, negative terminal from the battery should go to the ring terminal on the output jack. That way the battery is disconnected when the cable is removed. If the bass works when it’s plugged in and has a good battery the hot is on the right output jack lug so you should be good to solder the battery minus to the third terminal on the jack. You could dig in with a multimeter and double check if you like.

 

[jefflaserfist]

Ok thanks that’s what I thought that the black should be going to that lug. I was just surprised they didn’t have it already done but it was made in China

 

[jefflaserfist]

One last question should I unsolder the black battery wire from the pot and go strait to the Jack lug or solder another wire from the pot to the Jack?

 

[Turnaround]

Disconnect the battery black wire from the pot and attach it to the jack.

 

[Matt Liebenau]

The black wire (battery negative) needs to go directly to the ring terminal on the output jack. That way the battery shuts off when the cable is unplugged. If it connects to ground anywhere else the battery will be live all the time and will drain quickly.