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9/19/14 1:33pm - Original Message: 'Testing a vacuum relay'
F4Gary Gold Member
Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 868
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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9/19/14 3:34pm - Reply: 'Re: Testing a vacuum relay'
rraider1
Former Member
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

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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