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1990 Mercedes-Benz 300E Question: How to test a central-door-lock vacuum pump for 1988 300E W124 body?

 

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carzen, Moorpark, CA, June 26, 2013, 09:13
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I bought a used central-door-lock vacuum pump for 1988 300E W124. To quickly test it, I applied 12V Battery supply to its power terminal with proper polarity. But nothing happened. There are also a three-wire plug for, I think, control signals; perhaps I need to connect these wires as well. Please let me know, thanks.

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