You should not need to add anything for the indicators to work is you are talking about connecting the the provided grey towing connector which was provided in the boot space on pre 2005 cars.
sounds like you need to start doing some testing with a volt meter at the various points to see if the indicator voltage is present, starting at the grey plug in the boot area that you connected to.
For ref. indicator wire colours are green and green with white trace in the grey plug pins 9 & 10
Shame your not closer to Mansfield could have provided help with testing.
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