Success! There are 4 plugs in the back of the DC/amplifier. One plug has 8 wires coming out and I reckoned that was the loudspeaker output. (2 wires to 4 speakers). All these had been cut and wires soldered in. There were 20 wires in the new loom and 12v (red) and earth (black) had been siamesed in to give power and earth to the new loom. These was a 20 pin socket at the end. 8 in, 8 back, red and black in don't know where the other two went. Cut whole loom out and reconnected wires. Took about 2 hours to do.
Connected battery up and sound from speakers! I must have heard another car with output from radio; it was impossible for this one to work previously.
Now to remove all the other wires.
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