Fuel Pump Relay Trigger?

Jeffncs

Jeffncs

Well-Known Member
Joined
Apr 4, 2017
Location
Wake Forest
77 Ford Bronco with a 5.0 and Centech harnss

I made the mistake of using the ignition switch stud for the relay which powers my accessory switch box and also has the fuel pump switch (goes cold when cranking!). Any suggestions on a circuit I can tap into that stays hot even when cranking?

Or should I just wire the fuel pump separately through a switch and the inertia switch…leaving the accessory switch box out of the equation?

I’m leaning towards pulling the switch out of the acc switch box and adding a separate circuit for the fuel pump on a switch. Just need to know where to tap into….
 
Jeffncs said:
77 Ford Bronco with a 5.0 and Centech harnss

I made the mistake of using the ignition switch stud for the relay which powers my accessory switch box and also has the fuel pump switch (goes cold when cranking!). Any suggestions on a circuit I can tap into that stays hot even when cranking?

Or should I just wire the fuel pump separately through a switch and the inertia switch…leaving the accessory switch box out of the equation?

I’m leaning towards pulling the switch out of the acc switch box and adding a separate circuit for the fuel pump on a switch. Just need to know where to tap into….
Click to expand...
Not knowing this stuff specifically but thinking about how it "should" work you would need to grab the Run circuit and can tap something that is powered with the ignition system which has power during a start. The back of the ignition switch itself should have a Run terminal and whatever that powers will work, cannot talk you through the wiring and fusing other than the pump should be interposed with a relay from that circuit.
 
Jeffncs said:
77 Ford Bronco with a 5.0 and Centech harnss

I made the mistake of using the ignition switch stud for the relay which powers my accessory switch box and also has the fuel pump switch (goes cold when cranking!). Any suggestions on a circuit I can tap into that stays hot even when cranking?

Or should I just wire the fuel pump separately through a switch and the inertia switch…leaving the accessory switch box out of the equation?

I’m leaning towards pulling the switch out of the acc switch box and adding a separate circuit for the fuel pump on a switch. Just need to know where to tap into….
Click to expand...
You can use the studs on the back of the fuse blocks, Also depending on what type of ignition system you used there should be an extra switched +12v wire under the hood. If you have a factory wiring diagram the centach is pretty close which could help you find a switched 12v
 
I would put it on a switch and send a ground signal to the coil.
 
Jeffncs said:
Can you elaborate?
Click to expand...
Load side of the relay to power your fuel pump. And the positive of the relay coil. Then just send a ground wire through a switch on the dash to the relay negative side of the relay coil.
 
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