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I replaced mine with a set of infinity reference 3.5's and it made a huge difference.
Crutchfield supplied plugs should have already matched the polarity of the radio in the truck. Their stuff is usually plug and play.
To figure it out on the OEM speaker this is how www.TechGuys.ca | How to: Determine speaker polairity Then you know which is positive and negative
Are you guys running only two speakers in the dash and leaving the stock 3rd speaker in the middle?
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Right but I'm talking about the part where I have to plug that harness into the speaker, I can reverse the polarity if i connect those wrong. Thats my concern.