Rear Defrost Wiring
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=140547
Printed Date: May 11, 2024 at 2:39 AM
Topic: Rear Defrost Wiring
Posted By: monty862
Subject: Rear Defrost Wiring
Date Posted: January 01, 2016 at 12:33 AM
Trying to determine the correct wiring set up for a 1989 Mustang rear defroster. There are four wires at the switch. #1. Pink/Orange, 12 volts with ignition on. #2. Gray/Lt.Blue, 12 volts only when switch is being pressed. #3. BROWN / Lt. Blue, 12 volts as long as defroster is on. #4. Pink, undetermined. I'm thinking I need to send a positive pulse signal to the #2. Gray/Lt. Blue wire, correct?
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Replies:
Posted By: monty862
Date Posted: January 02, 2016 at 8:46 PM
I didn't get a reply before I started the defrost hookup so after testing myself I can confirm that a 1989 Mustang needs a positive pulse to the Gray/Lt. Blue wire at the switch or relay. You might want to add this info to the Mustang wiring diagram.
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