Day 3 of trying to make the stupid radio work -.- tested old radio and that works, plugged in the adapter harness and new radio and nothing, tested new radio in the starlet and it fired straight up, back in the Volvo, nothing. Checked all the fuses and they're all intact, changed the radio one just in case, but nothing. Tested continuity of the new harness and that's all good too, last chance is to plug it all in and work my way along each wire testing for current to the radio, if that doesn't work then I'm completely stumped!