As there have been no replies I thought I would post an update to benefit anyone doing searches in the future.
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Here are the wiring colours of an mk1b radio system.
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NOTE
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I did not trace all these wires back myself, I just used the coding from the cable adaptor I had from my MK2, therefore I accept no responsibility if these are wrong
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(but my radio is working fine)
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Front left
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+ve
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: Pink, Red dash
Front left
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ve
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: Purple
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Front right
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+ve
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: Light Green, Red dash
Front right
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ve
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: Blue
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Rear left
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+ve
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: Black, Red dash
Rear left
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ve
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: Yellow, Red dash
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Rear right
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+ve
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: Red, Blue dash
Rear right
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ve
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:White, Red dash
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Constant supply
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: Blue, Yellow stripe, Red dash
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Switched supply
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: Grey, Red dash
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Earth
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:
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(Sorry, forgot to record this one)
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Lights
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: Dark green
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Ariel
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:
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(2 wires on car both connected to same radio wire)
a) Black, Red stripe, Red dash
b) Pink, Blue stripe, Red dash
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Hope this is of some use to someone in the future
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Cheers
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Peter