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Testing a vacuum relay

Forum: C3 Electrical, Body and Interior

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Testing a vacuum relay

Posted: 9/19/14 11:33amMessage 1 of 2
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Grapevine, TX - USA
Joined: 8/26/2006
Posts: 1537
Vette(s): 1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport M7 convertible.
I have a relay out of a car and want to test it to see if it is good.

The small metal port on top of the can holds a vacuum.

If I plug the very bottom port G, it will not pull a vacuum through the center port Y. Nor will it pull a vacuum through Y if I plug the other port R.

Bad relay?

   

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Re: Testing a vacuum relay

Posted: 9/19/14 1:34pmMessage 2 of 2
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Top small port should hold vacuum

with that vacuum supplied air should flow from Center/yellow to green/bottom (open lights)

with no vacuum applied air flow center/yellow to top/green (close lights) here is a video

http://www.youtube.com/watch?v=kSeX1aOKsfY


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