Audio help with 95 240sx

[GBSilviaS15]

Audio help!!!!!!!!

Okay, I bought a wire harness to install a new deck... We hooked up just the power wires to the deck to see if it even works, it didn't. Then we tested the deck on the battery, it did work. We couldn't figure out what was wrong so we just put the stock cd player back in, now that didn't work!? Can anyone help at all?

I checked fuses already...

[D-3vil]

If it worked before and not anymore, chances are it's something you did. Try checking your connections carefully; using a multimeter is highly recommended. It will tell you whether there's juice in those cables, and can also tell you if you have a broken wire.

[carrera]

if you used the stock wiring for the speakers, you need to connect the amplifier turn-on wire, usually light blue or blue and white.

[turtle]

make sure u have a good ground wire