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So I got this sweet tail tidy with a new brake light, but I don't really know how to wire it. No instructions available.

There's 3 wires coming from the light: blue, green and yellow. How should I connect them to the stock wiring?

The license plate light is integrated to the tail light. There's separate wires for that in the stock harness. I guess I won't be needing them anymore?

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Premier,
Have you tried running a 12v power source and ground to each wire to determine what each does.

You should have 1 ground, 1 normal brake light positive, and 1 running light positive.

The colors sound a bit off, but blue (and/or purple) is generally for keyed power.

I hope this helps get you started.
 

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Devious2xs said:
The colors sound a bit off, but blue is generally for keyed power.
I was thinking (yes I know dangerous)

Blue= brake
Yellow=running
green=ground

If I remember the running pos, and license plate light's pos were both yellow......  Ref diagram on the last page of service manual. Blue is output from connector to brake light (#36 coming from #34 brake light switch). Yellow is input into connector for rear running light (from key switch #47--->36&37)

Ought to be worth a shot!
 

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A couple of weeks late here and hopefully you have it worked out by now.
You would expect the green to perhaps be the ground, but no guarantee.
If you have a circuit tester, the easy way would be to find if there is any connectivity between each of the combinations of three pairs

Say for example you get a reading between blue & green & also yellow & green but 'open' between blue & yellow, then green would indeed be the ground (or common)
Then take wires directly to battery & connect the green to battery minus and connect each of the yellow & blue in turn to the battery plus, to find which is the brighter, obviously your brake.

Even if you have no circuit tester, you can connect any combination of pairs across your battery without doing any damage to either the light or the battery (or yourself!).
Note that if you get no light for any pair of wires, try reversing the connection in case they are LEDs as opposed to incandescents. If you find a pair of colours that does not work when connected either way round to + & -. then the other is your ground!
 
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