Need signal from car stereo to power subwoofer with no RCA hook up on powered subwoofers and one blue on the back of stereo

[shell_]

I have a Jensen stereo with a blue subwoofer RCA and a kicker subwoofer with built-in amp with no RCA hookup at all how do I get signal to hear music through my speakers currently I got blue lead light but no sound from subwoofer how do I cure this problem my subwoofer amplifier only has to power 12 volt 2 blue remote ports and also left negative and positive speaker and right positive and negative speaker

 

[americanaudiophile]

Without RCA inputs you will have to connect the Kicker to the closest left and right speaker wires in parallel with those speakers. You would not change the set up on the Jensen since you can't use the subwoofer out.
I suspect there is a way to modify the Kicker to install RCA inputs but don't know if that is something you would want to undertake. How easy that would be would depend on the construction of the Kicker electronics.