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How to test relay switch

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#1 BroncoJoe19


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Posted 03 July 2008 - 05:53 AM

Fuel pump relay switches, and other relays are similar to the starter solinoid, in that they make a high amperage connection through a switched low amperage connection.

Here is my fuel pump relay.


There are two smaller connections, and two larger connections.
TO test it, apply 12v to one of the smaller connections, and ground the other smaller connection.
(I used to small aligator clipped jumper wries separated by a small piece of cardboard to keep them from shorting against each other.)

You should hear it click. Then check for continuity between the two larger connections.
Now remove the power from the smaller connections and recheck continuity between the larger connections.
With power, one should have continuity, without power it should be an open circuit (no continuity).

Edited by BroncoJoe19, 03 July 2008 - 05:56 AM.

BroncoJoe19... I am not a professional mechanic, nor an engineer.
One should always obtain professional advice before attempting a repair or modification.

1990 Tan on Black Eddie Bauer - resides in North Jersey
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Auto hubs with manual transfer case snorkel

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