Quote:
Originally Posted by Dan Stokes
A couple of questions:
1) Is there a vacuum switch on a VW to turn it off and on? Mine won't need to run very often as it only needs enough slurp to shut the engine off but I'd like it to not run if not needed.
2) Which wire is ground? I got the pigtail and a little wire from the harness so I can make a plug-in connection but I don't know which wire is which.
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No vacuum switch on the VW pump. It is controlled by the ECU, which is why I was headed down the path of using a microcontroller to turn it on and off. If your's is only used for shutoff, that pump is kind of overkill. I'd just hook it directly to a momentary switch (and a relay) and use a pin-hole in the vacuum line to bleed off vacuum so you can restart right away.
The Red/Green-stripe wire is the positive and the Brown/Green-stripe wire is ground.