89 F150 Accessory wire

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=67815
Printed Date: July 02, 2025 at 5:31 AM

Topic: 89 F150 Accessory wire

Posted By: forbidden
Subject: 89 F150 Accessory wire
Date Posted: December 06, 2005 at 5:57 PM

Is missing in action. None of the wires from any of the wiring guides actually matched the wires we found in this vehicle. The RS works fine but no heater. Wondering if anyone has come across this before?

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Top Secret, I can tell you but then my wife will kill me.

Replies:

Posted By: Mike M2
Date Posted: December 06, 2005 at 6:03 PM

Should be gray / YELLOW. When in doubt, energize them all with relays...

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Mike M2
Tech Manager
CS Dealer Services

Posted By: forbidden
Date Posted: December 06, 2005 at 6:54 PM

Nope, go fish! After looking a little closer and discovering that the main bolts that hold the steering column to the dash were missing and then looking closer at the wiring, it looks like everytning has been modified from stock. It actually appears that the heater circuit is now controlled by a relay that is a neg trigger. WTF?

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Top Secret, I can tell you but then my wife will kill me.

Posted By: infinkc
Date Posted: December 06, 2005 at 7:13 PM

are you able to test for it? off the ignition switch? or just test it at the heater to see what goes 12v when the car is turned on and run power to that point.

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There are 10 types of people in the world, ones that understand binary and ones that dont.

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