I want to add tweeters to my 09 lariat screw and can't find a diagram with the colors for the + and - wires. The wires on the stock front door speaker are green and brown without any stripes. All the post I have read here say at least one wire has a stripe. I have also read here about testing the speaker with a 9v battery to determine the polarity of the wires. Does this work? Thanks

 

Nevermind, I figured it out.