I everyone i am new to the site i have a quick question on a after market faceplate i have a pioneer dp3900 the question is i have the 6 disk cd changer with the regular sterio i believe its the shaker 500 idk what it is but there are 2 amps under the deck plate in the back where the speakers sit, i have a vehicle wiring harness where it hooks in to but there are 2 other plug ins too where do they go and are they going to be ok left alone when i hook up my pioneer deck. thanks