I've installed a cheap CD head unit to keep my going whilst my empeg is being repaired but I'm having trouble with it.

I get power ok, and am able to tune the radio in, but I don't get any sound from my speakers.

I have an amp in the boot and forward and rear speakers. I've tried plugging the pre-out into either set of RCA plugs leaving the other pair loose. No sound anywhere.

When I removed the empeg sled I noticed that there was a blue wire coming from the direction of my amp. It had a bullet connector that conneced onto a blue wire on the empeg loom. Any idea what this is, and could it be causing the problem?

What else could be the issue? A blown fuse somewhere? If the speakers were shorting out somewhere, could this cause an issue?

Any suggestions would be appreciated.

Or should I just GAMI?