SO first off this took me about a week to finally figure this out. so for anyone who has already played with the speakers you will notice if u just try to upgrade your speakers and unplug the tweeters you lose power to both speakers. from my research it appears that the tweeter and woofer are wired in series so if u just try to splice in new tweeter with the factory wires you will get way too much power to the tweeter and they will sound horrible.
so here what i did after some trial and error
first off here are the speakers i added: apline type-s components in the from the sonys in the rear.
remover the door panel and take the complete tweeter out and its bracket (bracket not shown in the pic)
I then cut open the sleeve around the tweeter. you will see 4 wires 2 red 2 black, from the factory they are combined down to one red and black up to the tweeter i cut the wires just before the two wires are combined then wired each color to its matching color.
this is the final product
then you mount your new speakers for the manufacturing specs when it comes to the tweeters you plug the connector you just spliced back to the factory end and you will now have power to your woofer.
heres my tweeter
now one thing to keep in mind the type-s i used have built in cross-overs in the woofers so i just ran the wires that came with the speakers up to the new tweeters mounted in the factory spot.
i m no expert so you do this at your own risk, but this is how i did my truck. i just did it today so i don't know if they are any long term problems with this method. if i didn't explain this well or was wrong about something just let me know and i will fix it.
sry if my spelling sucks