Vauxhall corsa speaker problem. Help!!

[ejw4216]

Hi, I've recently bought a vauxhall corsa '04 and have replaced the speakers in the front doors with FLI speakers with and parcel shelf with Alpine's. Also i have connected a JVC head unit, replaceing a previsous rubbish headunit that came with the car. After some hours of trying to fitt the speakers and radio, they were all wired up. Everything was working perfectly and in order.

However, after recently disconnecting the parcel shelf speakers to put something in the boot and then reconnecting them, the rear left speaker is not working I have checked the speaker its self, to see if that's the problem using the wire from the other side and it still plays fine, the problem seems to be that, the wiring coming through to the speaker is now bringing no power. I dont know what seems to be the problem and was wondering if anyone knew how I could fix it.

Thanks