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Showing content with the highest reputation on 11/12/2020 in all areas
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1 pointI'd say don't bother testing, just replace it with a new one - that noise it's making in your video is not good.
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1 pointThe part number suffix (letter) can change to indicate a later version or substitution. Hella are a good brand - chances are the VW one is made by them or by Bosch, so I wouldn't worry about quality. The relay can go bad over time - a good way to test this is to jumper the connection the relay makes with a short length of wire - this should run your pump directly. It's a fairly common relay and should be easy to source.