Hiya all I new here my names Scott I need some advice please if possible so I own a 84 coupe gt and I've replaced the fuel pump and now there no power the car hasn't been ran in awhile I've checked the fuel pump relay and it clicks with a 9v battery is there anything else I could try to fix the issue I've checked with a multimeter with the ignition on and cranking it and there no power 

9 volts? It should be at least 12.4 volts with no load! Charge it it up and test again.

17 minutes ago, cliffcoggin said:

9 volts? It should be at least 12.4 volts with no load! Charge it it up and test again.

Thank you for replying I used a 9v disposal battery

Edited November 19, 2025Nov 19 by audicoupegt1984

Do you seriously expect a 12 volt system to work on 9 volts?

2 minutes ago, cliffcoggin said:

Do you seriously expect a 12 volt system to work on 9 volts?

I got told to check the relay using a 9v battery 

Scott.

You are not telling us the full story here, so how about you give us some details about the symptoms of the starting problem, what you have tested, and what you have attempted to do about the problem?

I apologize for the confusion so there is no power going to the fuel pump I've test the wires going to the pump with the ignition on and while it's cranking over and it's not showing any power coming threw I've removed the fuel pump relay and I've tested that with a 9v battery and it seems to be working 

Try it with 12 volts.

Hi Scott. I get what you mean about checking the relay coil operation with a 9V battery and you say the coil operates out of the car. Can you detect the coil operating when it is plugged into the car, ie is it getting the 12V power from the car/ignition switch to operate the coil? If yes, have you checked that there is a 12V supply for the relay to send to the fuel pump? The coil may operate to close the switch but if there is no 12V to send to the fuel pump then you may need to look elsewhere like fuses. Apologies if you already know this but relays are just remote switches that draw low current. Their job is to switch the much larger currents drawn by equipment like the fuel pump, headlights etc so that the switch you turn or toggle in the cabin only needs to carry low current. Relays have at least four spade connectors on the base. Two (smaller) ones are the coil to close the switch and two (larger) ones send heavier current to the load, in your case the fuel pump. Does any of this help?