Reed switch staying permantly closed
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=16797
Printed Date: July 18, 2025 at 9:42 PM
Topic: Reed switch staying permantly closed
Posted By: phamine
Subject: Reed switch staying permantly closed
Date Posted: July 28, 2003 at 3:34 PM
I'm using a normally open reed switch for a fuel kill. But i've noticed that 2 reed switches I've used have stayed closed after a few uses. Here's the diagram I used: https://www.ae92gts.com/downloads/cutout.doc What should I do to keep the reed switches from staying closed. They stay closed after i remove the magnet to actuate them.
Replies:
Posted By: cool_greg
Date Posted: July 28, 2003 at 5:29 PM
most likley find that the reed switches can't handle the current needed to energize both the relay and fuel cutout, and the contacts are fusing closed, i suggest you use the reed switch to switch another relay which in turn switches the other relay and fuel cutout
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Just a Guy, Wiring up those Vehicals
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Gool_Greg
Posted By: xetmes
Date Posted: July 28, 2003 at 6:47 PM
Yea most reed switches cant hadle much current, i would definitly use it to drive something else pref a transistor or if capable a relay.
Posted By: phamine
Date Posted: July 28, 2003 at 7:44 PM
cool_greg wrote:
most likley find that the reed switches can't handle the current needed to energize both the relay and fuel cutout, and the contacts are fusing closed, i suggest you use the reed switch to switch another relay which in turn switches the other relay and fuel cutout
How would I wire it so it would do what you mentioned?
Posted By: xetmes
Date Posted: July 28, 2003 at 8:00 PM
here is what i would do... oops i cant seem to upload the diagram... maybe ill try later
Posted By: cool_greg
Date Posted: July 28, 2003 at 8:19 PM
just wire the relay contacts where the reed switch was, put one side of the coil to ground, and the other side of the coil thru the reed switch to the 12+ factory fitted supply wireto fuel pump (I tried to uplod a picture but it would work - who knows why?)
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Just a Guy, Wiring up those Vehicals
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Gool_Greg
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