Instructions for Installing the STS-1M5PW Harnesses Into a 2005+ Ford Mustang
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These instructions are for installing the STS-1M5PW 2005 Mustang Sequential Turn Signal Harnesses from Web Electric Products. This state of the art system, when installed properly, will provide you with years of trouble-free service.

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There are three easy steps to this installation.  The first is to remove the fixtures and harnesses.  The second step is to install the new harnesses into the light fixtures and the third is to remount the fixtures onto the car.  Follow the step-by-step instructions below and in no time, you will be driving a car that not only looks better, but is now safer because it is getting more attention by the drivers behind you.

Removing the Taillight Fixtures (procedure used on both sides of the car)

1) Directly behind the fixture, remove the plastic fasteners that hold the trunk liner. Flex the liner back to expose three nuts that hold the fixture in place. Using a 7/16" deep socket, remove the nuts and pull the fixture away from the car body.

2) Using a small screwdriver, carefully press the connector retaining tab and disconnect the harness from the plug. Remove the grommet that holds the harness in the car body. Remove the tail light fixture from the car and take it to a work bench. Place a soft cloth on the bench in order to protect the lens.

3) Remove the sockets from the tail light fixture using a counter-clockwise twist. Pull the light bulbs out of the sockets, and place the bulbs into the new harness.

taillight fixture removed from car

 

Installing the Sequential Harnesses

4) Install the sockets of the new harness into the fixture, noting the number and position of the bulbs. Socket #1 is the inside socket, closest to the license plate. The #2 socket is the middle socket, and the #3 socket is the outside socket, furthest from the license plate. The small unlabeled socket is the backup lamp.

5) Insert the harness back into the car. Re-connect the plug. Use one or two nuts to hold the fixture in place and turn on the hazard flashers. Check to see that the lamps sequence from the inside of the car to the outside. Then remount the fixture.

Repeat the above steps for the other side of the car.

Button It Up

Use the supplied tie wraps or some electrical tape to hold the modules to the wiring harness. If you use tie wraps, leave them very loose. DO NOT OVER TIGHTEN THEM. If you damage the cover, the unit may not function properly.

Reinstall the nuts that hold the fixtures and put the panels back in place.

inside the trunk

 

Non-sequencing brake operation

- The STS-1M5PW harnesses can be programmed for non-sequencing brake operation.  At the modules, modify the wiring as per the STS-1M instructions.  You must cut the GREEN module wires as shown:

accessing the control wires

Then run a pair of wires from the modules to the passenger side kick panel.  You can use #18 speaker wire, lamp wire, or any other paired wire that has polarity indication.

Behind the kick panel is the Smart Junction Box (SJB).  To access it you need to remove the door sill panel and then remove the kick panel.  There are no screws on either of these, they simply pop off.  You do not need to disconnect any wires.  Remove the SJB by removing 1 bolt at the bottom.

bottom bolt on smart junction box

There are several connectors on the back of the SJB.  The second one from the bottom is GRAY.  On that connector find a GRAY wire with a BLACK STRIPE (this is the LEFT turn signal) and a DARK BLUE wire with an ORANGE STRIPE (this is the RIGHT turn signal).  The use of a simple test light with the turn signals on in their respective positions should confirm these two wires.

gray connector

Connect one of the paired wires to the GRAY wire with a BLACK STRIPE (left turn signal), and connect the other one of the paired wires to the DARK BLUE wire with an ORANGE STRIPE (right turn signal).

At the modules, connect the paired wires to the appropriate green module wire (right wire to the right module green wire, left wire to the left module green wire).

The above connections will give your STS harnesses the control from your turn signals and eliminate brake light sequencing.