Just changed my battery as my last one died...

my rear speakers weren't working so i got out and checked the amp and its not on...

checked the fuse switch thing under the bonnet and it seemed fine.

anyone got any ideas?

have you checked the fuse in the amp?

If the amp hasnt turned on like 97altera said check the fuse(s) on the amp.

If that is ok check you grounding

If that is ok check your remote turn on wire

I bet it is one of the the above...

Get a multimeter and check the amplifier has earth, 12 volts at the power input and 12 volts at the remote. That's the first step.