Aftermarket AM/FM/CD radio

1990 dodge caravan replaceing the stock radio to an after market Sony.

I used the Scorch install harnes and i have all the wires where they supposed to go.

My problem is After installing 3 different Radios AM/FM works Great but CD player you can barly hear the music.

My Question to this is,

IS there a pre amp just for the speakers built in the Caravan and if there is then how do i get it to work with the CD player?

Thanks Mufasa004

Our 97 T&C had a preamp for the speakers, dont know about the earlier models though, our 86 Caravan does not have one though

thank you ill have to hunt it down and see i have talked to the local radio shops and sound FX shops and they dont know either.

i did however figure out that there is a blue wire on the wire harness that needs accy power to make the speakers sound normal as of now its hooked up to on or off mode so if i have a seperate power to it. it will stay on reguardless if the radio is playing or CD this is what i have thought about and will try it in the morning.