yet another scanner led question
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=16058
Printed Date: September 10, 2025 at 9:26 AM
Topic: yet another scanner led question
Posted By: drd4life
Subject: yet another scanner led question
Date Posted: July 08, 2003 at 4:46 PM
I'm sure someone has already answered this, but here it goes. How can I wire a three wire scanner to light up when the car is off, without an alarm? (by three wire I mean 12v+, ground, and trigger.) I already shorted a scanner wiring it to my alarm's negative output, (however the starter kill was also on, I guess it can't be wired like that) So I now disconnected the starter kill and wired the trigger wire from the scanner to the negative output of the alarm, 12v+ to a constant lead, and ground to a good ground. Now the scanner is always on, alarm on or not. Any ideas?
Replies:
Posted By: xetmes
Date Posted: July 08, 2003 at 5:09 PM
If the trigger is a negative trigger i would use a relay and wire as so: Terminal 85 : Ground Terminal 86: Ignition (+ while car is on) Terminal 30: To trigger on scanner Terminal 87: +12 V Terminal 87a: Ground It would then be off while the car is on, and on while the car is off
Posted By: HondaTypeSE
Date Posted: July 08, 2003 at 8:11 PM
i did this with +12V to 30, ignition t0 85, ground to 86 and trigger to 87a so that its on when car is off, and goes off when u start it.
Posted By: drd4life
Date Posted: July 09, 2003 at 8:52 AM
Sounds good. thanks guys!
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