hello, im setting up a bass for sale. it's a cheap bass that has a very confortable playing, it's build allows a very low action. i took out the screws of the electronics cavity and i found that the signal that was conected for amplifying was the (-). it has a very particular sound but im thinking about setting it up in the commun way. There are something just bad in the circuit, i have uploaded a picture for you to see. have any of you setted up your bass with the (-) signal for amplifiying?