Jump to content
66-96 Ford Broncos - Early & Full Size
Sign in to follow this  

How to test relay switch

Recommended Posts

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

Share this post

Link to post
Share on other sites
This topic is now closed to further replies.
Sign in to follow this