Can anyone advise me here. I have a 1973 1303s. It has a two speed wiper motor, but I think it must be wired incorrectly as it is only operating on low speed and not 2 speed and park.

It has 4 wires. Green, Black & Grey, Black & Yellow and Black.
Which wire should be connected for slow speed, 2 speed and park
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Hi there! Found this info on Facebook: “Green connects to 53E on the wiper motor, black/ grey 53A, black/ yellow 53B, and black 53. Green is park, black/ grey is low speed. I'm about 90% sure straight black (53) is high speed.”
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