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Fixed the stereo, I think the power wire had come loose. It was reading power when I put the test light on it, and the radio started working again, then promptly died when I started to push the wiring back into the dashboard.
When I brought it out for the second time, the main power wire came free, suggesting to me that the join had separated already under the electrical tape.
Decided to get on a roll and actually wash the car*
any implication that I actually wash the car myself is henceforth withdrawn