Originally Posted by imdon63
I own a 2010 Dodge Laramie quad cab with the factory Alpine stereo system - the sub. If I were to buy a factory sub used is the wiring already there?
Interesting... I am guessing that you bought your truck used since I have not seen a factory alpine system without the sub.
To locate the harness... Look under the passenger rear seat in the storage bin. Peel back the carpet on the front lip of the storage bin. The harness should be tucked in there somewhere.
As long as you have the harness then you should be able to just plug in the factory sub and go.