Old 551T. Need help with 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=34323
Printed Date: July 15, 2025 at 2:58 PM

Topic: Old 551T. Need help with wiring

Posted By: Ashez
Subject: Old 551T. Need help with wiring
Date Posted: June 21, 2004 at 9:05 PM

I went to Directed.com but theyre not showing anymore car security diagrams. Ive also searched these forums for 551T, but I still have a couple questions some of you might be able to answer. I have the 551T with the 12pin harness, however there are only 11 wires comming out the harness. When I searched these forums, I found out that the only wire I was missing, with the yellow. From top to bottom here are the wire colors in order:

Black, gray, blue, WHITE/ blue, WHITE/ black, 2 brown wires, white, gray (again), orange, and blue/black. Can anyone help me out with a diagram for this? Remember there are only 11 wires, but its a 12pin harness. (I can tap into the harness and add another wire if needed.)

As for the relay, I have 1 free red wire comming out of terminal 86 of the far left relay. Id say its about a 16ga wire, but I dont know what its supposed to connect to. The other wires are:

2 red with 30amp fuses (Im assuming its for the 12v cons.), yellow, brown, orange, pink, black. All heavy gauge wires. Any help will be greatly appreciated. TIA

Replies:

Posted By: auex
Date Posted: June 21, 2004 at 9:35 PM

Ask and you shall recieve.

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: Ashez
Date Posted: June 21, 2004 at 11:19 PM

Thanks, but mine doesnt have a status LED on it? Does it matter?

Posted By: CutDog504
Date Posted: June 21, 2004 at 11:43 PM

you must have the "older" 551t. I have one of those hanging around also. I think it was made in about 95 or 96. Still to this day, I haven't figured out the wiring, so its still sitting collecting dust.

Posted By: 02SS
Date Posted: June 27, 2004 at 12:24 AM

If you call DEI they will email you the wiring diagram for the 551T.