Wiring a kill switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmsteele92831 · 05-13-2007, 02:19 PM

I've tried to search this out but no one gives a complete wiring description for a kill switch for an electric fuel pump. The switch I bought has two prongs on the back. I connected a positive wire to one then tapped into the positive wire on the fuel pump. Then I connected a negative wire to one and grounded it. But it didn't kill the fuel pump when I turned the ignition key to "ON". Also I put in a 20 amp inline fuse and the switch I'm using is a 10 amp. Any ideas on this? Is it hooked up wrong?

eedgell · 05-13-2007, 02:41 PM

I think your switch needs to be in the middle of the circuit not at the begining or the end. It must just be a "stop" in the line. Not a starting point or an ending point.

Overkill67 · 05-13-2007, 03:33 PM

Ok all you ned to do is put the switch somewhere in between the positive and the pump, no need to ground the switch. if you ground it (other than if it is one with a light) your going to burn the switch, and if your lucky thats all......

Like this + ------------ switch ---------------- fuel pump positive connection

st1x10 · 05-13-2007, 03:40 PM

Yes like that above. The switch opens and closes the circuit.

Longhorn Man · 05-13-2007, 03:44 PM

Is there a realy in your circuit too somewhere?
If so, then you need the switch in the relay circuit.
If no... then you really should.

dmsteele92831 · 05-14-2007, 12:43 PM

So what about the extra pin on the back? Is it of no use?

dmsteele92831 · 05-14-2007, 05:22 PM

I did the above, just running the switch on the positive wire, and nada. Do I need to run an alternate power source to the switch (like to the fuse box)?

**Don Brace** · 05-14-2007, 06:12 PM

The best place to do this would be right at the fuel pump. Connect the original wire that goes the the positive of the fuel pump to one pin on the switch. Connect the other pin of the switch to the positive connection on the fuel pump. This will allow the switch to turn the pump on and off. Make sure you tape up any of the bare connections.
Don Brace MN

dmsteele92831 · 05-14-2007, 07:15 PM

Ahhh, I gotcha, Ill give that a try!

*jojotonka* · 05-14-2007, 07:49 PM

I just put a switch on the dash of my 72 Jimmy last month. I have a blue Holley pump. I put the switch IN LINE of your hot wire. NO ground is necessary. Holley only called for a 7 amp inline fuse. 20 amp could be to high.

dmsteele92831 · 05-15-2007, 02:43 PM

So I should use a lower amp inline fuse? Also, should the fuse go in between the power source and the switch or in between the switch and the pump?

Shyguy · 05-15-2007, 05:40 PM

As close to the power source as possible, that way it protects the wire, the switch and the pump.

Danny -SEMO

dmsteele92831 · 05-15-2007, 05:42 PM

What about the 20 amp fuse, is that ok?

05-13-2007, 02:19 PM	#1
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Wiring a kill switch I've tried to search this out but no one gives a complete wiring description for a kill switch for an electric fuel pump. The switch I bought has two prongs on the back. I connected a positive wire to one then tapped into the positive wire on the fuel pump. Then I connected a negative wire to one and grounded it. But it didn't kill the fuel pump when I turned the ignition key to "ON". Also I put in a 20 amp inline fuse and the switch I'm using is a 10 amp. Any ideas on this? Is it hooked up wrong? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

05-13-2007, 02:41 PM	#2
eedgell It's the air up here Join Date: Mar 2007 Location: Western Colorado Posts: 710	Re: Wiring a kill switch I think your switch needs to be in the middle of the circuit not at the begining or the end. It must just be a "stop" in the line. Not a starting point or an ending point. __________________ 1971 cheyenne k10 4 speed np 205 454 BB factory a/c Never drink down stream of the herd! Eric

05-13-2007, 03:33 PM	#3
Overkill67 Registered User Join Date: Apr 2007 Location: Roselawn, Indiana Posts: 60	Re: Wiring a kill switch Ok all you ned to do is put the switch somewhere in between the positive and the pump, no need to ground the switch. if you ground it (other than if it is one with a light) your going to burn the switch, and if your lucky thats all...... Like this + ------------ switch ---------------- fuel pump positive connection

05-13-2007, 03:40 PM	#4
st1x10 Registered User Join Date: Feb 2006 Location: Oklahoma City Posts: 588	Re: Wiring a kill switch Yes like that above. The switch opens and closes the circuit. __________________ 1970 Chevy C10 "Under Construction" 2002 Chevy S10 V6

05-13-2007, 03:44 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Wiring a kill switch Is there a realy in your circuit too somewhere? If so, then you need the switch in the relay circuit. If no... then you really should.

05-14-2007, 12:43 PM	#6
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Wiring a kill switch So what about the extra pin on the back? Is it of no use? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

05-14-2007, 05:22 PM	#7
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Wiring a kill switch I did the above, just running the switch on the positive wire, and nada. Do I need to run an alternate power source to the switch (like to the fuse box)? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

05-14-2007, 06:12 PM	#8
Don Brace Active Member Join Date: Nov 2002 Location: Clarks Grove MN Posts: 487	Re: Wiring a kill switch The best place to do this would be right at the fuel pump. Connect the original wire that goes the the positive of the fuel pump to one pin on the switch. Connect the other pin of the switch to the positive connection on the fuel pump. This will allow the switch to turn the pump on and off. Make sure you tape up any of the bare connections. Don Brace MN __________________ Don Brace 55 Nomad 56 Nomad 58 Impalla Coupe 58 Bel-Aire 4D HT 61 Impala CVRT 409 4 SP 2- 71 Longhorns Always looking for old toy trains, Juke boxes Pin ball and game machines.

05-14-2007, 07:15 PM	#9
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Wiring a kill switch Ahhh, I gotcha, Ill give that a try! __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

05-14-2007, 07:49 PM	#10
jojotonka Account Suspended Join Date: Jan 2007 Location: lennon, michigan Posts: 162	Re: Wiring a kill switch I just put a switch on the dash of my 72 Jimmy last month. I have a blue Holley pump. I put the switch IN LINE of your hot wire. NO ground is necessary. Holley only called for a 7 amp inline fuse. 20 amp could be to high.

05-15-2007, 02:43 PM	#11
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Wiring a kill switch So I should use a lower amp inline fuse? Also, should the fuse go in between the power source and the switch or in between the switch and the pump? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi

05-15-2007, 05:40 PM	#12
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Wiring a kill switch As close to the power source as possible, that way it protects the wire, the switch and the pump. Danny -SEMO

05-15-2007, 05:42 PM	#13
dmsteele92831 Registered User Join Date: Oct 2006 Location: SoCal Posts: 191	Re: Wiring a kill switch What about the 20 amp fuse, is that ok? __________________ 1968 c10 Chevy 2005 Infiniti G35 2006 Subaru WRX STi



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