Hi Wellis,
mine is a series 1. I thought the park function was from contacts in the wiper motor (or gearbox) itself. The relay was only for the intermittent variable speed delay. I can recall when the wiper switch on mine did not work (often) the intermittent knob was a way to energise the motor. You could always hear the relay click after the intermittent delay time had passed.
there is a very good technical description of the required switch connections at: lucas wiper connections
A google search reveals parking problems commonly arise from the switch being incorrect. Hopefully some of this will help.
regards
Peter
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