Is your meter set to AC? I don't think my meter shows negative voltage with AC, only DC (it's a pretty basic meter though).So it connected the wires back to where they were originally. So all good there. I pulled the head unit and tapped into the left front channel speaker wires from there.
Now on the left channel of the RCAs i am seeing the same voltage as the right channel, 3V...but the left channel is showing -3V. I rechecked the wiring and its all positive to positive and negative to negative, so im not sure why its -3V. Should I switch the positive and negative wires where they connect to the RCA adapter?
Another wierd thing..just before i cut the left channel wires and soldered my speaker cables to them, the head unit played music through the rear speakers fine since that wiring was untouched from stock. But once i wired in the left channel wires, the rear speakers became silent. I didnt touch or mess with the rear speaker wires at all. My RCAs seem to be getting voltagefrom both front channels, so im not sure why the rears suddenly stopped working. Any thoughts?
You shouldn't be cutting OEM wires, ever. I'm a bit concerned that you're in over your head, and are risking some big problems. If you don't want to use a proper wiring harness, you should at least be using good wire taps, not cutting wires.