I'm installing a stereo head unit and don't have sound. This blue wire comes from the included harness and is the amp control wire. The control wire on the other connector at the unit also says amp control and isn't connected to anything. I'm assuming I have to connect the two wires and this thing (plus heat shrink wrap...?) will help. I'm unsure if I should use this or cut and strip the wires and find some wire nuts. How do I use this connector, (if it even is one)?
Does your car have an amp? Many don't so your problem might lie elsewhere.
You might be able to get wiring instructions from Crutchfields website. They're great for stuff like this.
Yes I have a factory amp. I'll check crutch field. I also want to connect the manufacturer off the unit since they included the harness.