How to Install Sequential Taillights

2 Taillight plugs are disconnected next. It doesn't matter what type of plug your Mustang has. These leads will be cut to accommodate the sequential turn-signal harness.

3 Taillamp assemblies are removed next. Each assembly is retained with four insulated tinnerman's nuts.

4 You'll need these foam gaskets that go between the body and taillamp. The new sequential taillamps from Scott Drake Mustang Parts install like this.

You can set up the wire leads either before or after you install the lamps.

5 Installed, the sequential taillamps look like this. The three lamps sequence to the left on the left side for a left-turn signal. Likewise, the right side sequences to the right with a right-turn signal. They also sequence when you step on the brake pedal with the ignition turned on. All six lamps are illuminated with the parking lamps or headlamps on.

6 The new lamp is secured the same way, with four insulated tinnerman's nuts.

7 Each taillamp has a specific wiring color code because each is different. On both sides, there are three red wires for the parking lamps. The rest of the wires are color-coded in blue, white, and yellow for brake and turn-signal lighting. There are three 1157 lamps per taillamp assembly. Each 1157 lamp has two filaments: one dim and one bright. Parking lamps are the dim filament, while the brake and turn signal lamps are the bright filament.

8 On the left side is a different combination of wire color codes, with the same trio of red parking-lamp wires. The brake and turn-signal wires are color-coded to prevent connecting the wires incorrectly. On the left are green, gray, and orange for brake and turn-signal wires.

9 Inside each turn-signal module, located in the trunk area, are two rheostats that control the sequencing rate. You can speed it up or slow it down.