u/No_Adhesiveness5852

My friend asked me to fix his bass as it stopped making any noise other than unintelligble static when plugged in. When I checked the wiring one wire connecting the audio jack was disconnected but it didn't fix the issue when I resoldered it, and then I changed all the Wires and still no dice. Would this be an issue with the pickups l, all the electronics or just one piece and how could I check?