Does anybody have a speaker wiring diagram for an 04 Quad Cab?

I went to replace the front factory speakers, however neither the wires nor factory speakers clearly identified which wire was positive and which was negative. I spoke to the store I purchased the speakers from and they said that the solid is most often positive and the striped is negative. However, both wires going to each side were striped. The front left had a light green wire with dark green stripe and a light green wire with a purple stripe and the front right had a light green wire with dark green stripe and a light green wire with black stripe.

Any thoughts?

Thanks, Ron

 

From 2004 Dakota Service Manual
Here's what you got, regardless of the type audio system (2-door/4-door/Base/Midline/Premium):

Right front (+) = Light Blue/Voilet stripe
Right front (-) = Light Blue/Black stripe

Left front (+) = Light Green/Voilet stripe
Left front (-) = Light Green/Dark Green stripe