is there any way you can show on this pic how the pickups wire into where they go.. and also my bass has 2 tiny toggle switches 1 of them i know are a bass boost and the other i cant tell what it does.. if possible can you show how these switches wire in or what the unknown might do?.. any help would be greatly appreciated.. have had this 6 string bass for 2 years and havent really played it any. got it from china and it didnt work properly when it arrived.. it had a wire un soldiered and i just picked a random place to soldier it to.. i know bad idea...... it plays quiet or dim/low.. unlike other basses i have, and when i rotate the balance knob or pickup knob only 1 pickup is working .... please help