I think i might have gotten to the bottom of it, theres a blue lead that says power antenna, and this also powers up the amplifier now because i don't have a power antenna, i didnt connect it up, i just stumbled on an video of someone with a another car, similar set up, same problem, and thats problem was that the power aerial lead, was in fact the amplifier power lead, and if i remember last time i had everything connected up via the iso adaptor, so everything power, speakers etc was via the BMW plug, So in theory, if i connect up this blue lead, to the adaptor, it will power up the amplifier which in tun will power up the speakers.
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