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Windshield Washer System

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I recently replaced the washer motor with a new Porsche one as the old one was not stock and didn't appear to be working properly. The new one works perfectly when connected directly to battery with washer activation occurring as expected. When I connect it to its own wiring however (confirmed correct connectivity, it is sporadic. I have confirmed power at the harness end every time I pull the steering column leaver, but other than that I can't figure out why this could be intermittent. I have looked in my Bentley manual at the electrical circuit and can only guess perhaps its the pulse transmitter relay, although in the book it refers to it as the headlight washer relay only. The circuit appears to flow through it either way (of note, the headlight washers actually work as designed). Is there a way to test the relay (P/N: 928-618-111-00 Hella Reinigungs-Steuergerat). I do understand what this means and seems correct as the item in question. There is also a reference to a potentiometer on the electrical diagram, but not sure whether that is integrated into the above part, or elsewhere.

Thanks.

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Have you checked the ground connection at the connector or used a test light across the connector's poles?

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As a follow up, I tested with both a light and multi-meter. Light fluctuated. Found the issue at the main lever switch (contacts on column arm are corroded. Managed to get some joy externally with electrical contact cleaner, but will be taking the column apart over the weekend to clean thoroughly.

Cheers

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