My Jamma Hanress Only Has One Plus and Minus Wire On #10 for the speaker, How Do I Hook up Two Speakers?

If your jamma harness only has 1 wire on the + - for the #10 speaker wire then simply run the speakers in parallel. Run + wire to one speakers + terminal and then on the oppsite speaker hook up the - wire to the - side of the speaker then simply run a wire from the + to the - from speaker to speaker. See Image below for easy to understand picture.