Aftermarket radio install in 2002 bmw 325ci,need help

[elvis24]

i took my stock radio out ad tryed to install aftermarket radio, i have the wrigt wire harness, i connected every wires, but when i turn aftermarket radio on it comms on but no sound from speakers, i don't know why any help

thanks

[m20enginebuilder]

Originally Posted by elvis24

i took my stock radio out ad tryed to install aftermarket radio, i have the wrigt wire harness, i connected every wires, but when i turn aftermarket radio on it comms on but no sound from speakers, i don't know why any help

thanks

First thing Id do is re take out the aftermarket radio and look at its wiring diagram it has on it for the right channels, both front and rear, and same for the left channels, then look at the wires for the speakers, they may have in line parts in them for tweeters and what not thatt require to be wired positive to positive. If hooked up backwards they may not let current flow to the speakers.

[elvis24]

i did wire the right wires like grey to gray,grey/black to grey/blay,white with white, white/black with wite/black..... but still no sound at all, i don't know but my bmw have a amp to,

[m20enginebuilder]

You might want to make sure you still have power on for the amp, because on the amp it has a power wire that comes into the amp from the stereo, so it turns on the amp when you turn on the stereo. You need to make sure its either hooked up to a power on the ignition that comes out of the switch to the amp. Or find the remote out power wire on your stereo and hook up the power wire for the amp to that wire so it comes on with the stereo. On the back of the aftermarket stereo theres a remote wire thats probly blue or something, its labeled. Use the wiring diagram on the back of the head unit. Er bottom i meant. There shoulod be another wire going back to the amp that may or may not be labeled remote. Hook that wire up to the remote wire on the head unit and it should turn on the amp and make the speakers work.