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Topic: Testing a vacuum relay

in Forum: C3 Body


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Testing a vacuum relay (1/2)
 9/19/14 2:33pm
F4GaryGold Member
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Grapevine, TX - USA

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


Joined: 8/26/2006
Posts: 1406

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 (2/2)
 9/19/14 4:34pm
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: 1165

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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