Rear Defrost Wiring

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monty862

Copper - Posts: 116

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Joined: December 10, 2009

Location: Kentucky, United States

Posted: January 01, 2016 at 12:33 AM / IP Logged

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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monty862

Copper - Posts: 116

Joined: December 10, 2009

Location: Kentucky, United States

Posted: January 02, 2016 at 8:46 PM / IP Logged

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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