Originally Posted by LakevilleSSEi
I think that you want to see no voltage from that test wire, and if the realys bad you'll se 12 volts...or something like that.
Let me get reinforcements in here.
That'* pretty close but I'll give a little more detail.
The test pin is connected to the normally closed contact of the fuel pump relay and can be used 2 different ways:
+12v can be applied to the test pin via a fused jumper from the battery with the ignition off. This will turn the fuel pump on and should be used in conjunction with a fuel pressure meter to verify adequate fuel pressure.
A test light can be connected to the test pin to verify that the relay is at least switching from the normally closed position. Not as accurate as testing the realy-to-tank wire (should be gray) at the tank connector or under the back seat. With the test light connected to the test pin, it will light up when the fuel pump relay is NOT energized and turn off when the relay is energized. Just like Lakeville has stated.