fuel pump kill relay

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=106070
Printed Date: May 15, 2025 at 11:28 AM

Topic: fuel pump kill relay

Posted By: nc_fairlane
Subject: fuel pump kill relay
Date Posted: July 12, 2008 at 6:03 AM

I am having a problem wiring up my fuel pump kill relay. The alarm has a - ve out put when armed. The problem is when the doors are locked the pump will run and when unlock the pump will not work. I have followed this diagram https://www.the12volt.com/relays/page2.asp

Normally Closed Starter Kill Relay

Replies:

Posted By: KPierson
Date Posted: July 12, 2008 at 12:57 PM

With a normally closed setup you should be able to start the car when the (-) when armed wire is disconnected from the relay regardless of the state of the alarm - verify that you can do this first.

It sounds like you have mixed up the 87A and the 87 pins of the relay - make sure you are using a normally closed contact pin (ie 87A) to wire the relay to the car.

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Kevin Pierson

Posted By: nc_fairlane
Date Posted: July 12, 2008 at 9:09 PM

I have tried that still wont work. I Have tried this diagram as well

85 - ignition 1
86 - GROUND from switch
87 - Starter wire key side (towards key cylinder)
30 - Starter wire Motor side (towards car)

Still not working

The relay has to earth when (unlocked) and no power when (armed)

Cheers Rick

Posted By: tedmond
Date Posted: July 16, 2008 at 3:32 PM

if your unit sends ground when you disarm insted when you arm, wire it like so. but, your unit might be programmable for how the wire sends out a ground

85 - ignition
86 - ground when disarmed
87 - fuel pump from cylinder
30 - fuel pump (pump side)

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