Going off memory here but the stock turn signal wiring is: Black for ground, purple and red, one is running lights and one is turn signal. The Kellerman only has 2 wires, one for ground and one for either running or turn signal. Hook up the ground and then just touch the wire to the other to see which one it is.
I have had a look at the Service Manual and the colours are as follows:
Black - Common Earth
Brown - Right Turn Feed
Violet - Left Turn Feed
Blue - Common Live, looks like running lights 'cos it links to the licence plate lamp. In the UK we do not have running lights on the indicators.