i'm fixing my friends squier jazz bass (grounding it) and i'm not quite sure which is the ground wire. i took off the bridge, and there is a black wire under it, so im assuming this is the ground wire. it doesnt appear that the company even soldered to the bridge, so would i need to do this to ground it correctly?
The wire was most likely just pushed through the hole under the bridge and had the bridge screwed down over it. This arrangement should work fine.