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Basically that means you are not providing the power to energize the relay. This can be the power supply or the ground circuit to the relay. Use your volt meter to check the power supply and to check the ground circuit. Do this with the relay connected.
From the battery positive terminal to the positive terminal on the relay. If you read any significant voltage there is resistance in the circuit that should not be there. If you read no voltage it may indicate a ground problem or the circuit is OK. Remember voltage drop indicates the proper battery voltage is not getting to the point where it can activate the relay.
On the negative side connect to the negative battery terminal and to the negative side of the relay (on the part that is powered by the ignition switch, not the fuel pump power supply. Use a jumper wire with alligator clips if you can not reach both points without one. I usually use a jumper wire to the negative so it can not short out.
This is where a bad ground can be your issue, or a bad connection (probably a corroded plug in the harness). By going from the battery to the ground connection on the relay, your are checking the whole circuit. If either test shows a voltage drop, then you have to go to different portions of the circuit and isolate the bad connection.
The ignition switch would be my focus point in isolating the problem (assuming you find the place where the voltage drops occurs). The ignition switch is part of power supply.
The ground circuit is usually a black wire (but not always, best to get a diagram of the circuit-found on the internet) and print out the part you need.
Sorry if I missed any spelling-spell check is not working tonight.
regards
Mech
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