How To Install a Raxiom 3rd Brake Light Flasher on Your 2005-2014 Mustang

Step 1: 

Remove or fold down the trunk lid appearance panel.

Step 2:

Locate the 3rd brake light wiring harness.

1999-2004:
Black
Green

2005-2009:
White/Blue
Black

2010-2014:
Black/white
Yellow/ Gray

Step 3:

Cut the 3rd brake light wires so that you have enough room to attach the Flasher wires with butt connectors. The solid wires coming off the 
module will connect to the chassis side of the wiring harness. The dashed wires coming off the module will connect to the brake light wires. 

Step 1:

Gently pull down on the rear head liner and unclip the 3rd brake like harness.

Step 2:

Locate 3rd Brake light wiring harness.

2015:
Black/Purple
Yellow/Gray

Step 3:
Disconnect the harness wiring harness so that you can make you connections, there is enough 
slack in the chassis harness if you pop it out of the clip holding it to the roof. 

Step 4:

Splice in the module. **NOTE: the 2 wires are wrapped in a fabric tape, and shielding wire. You have limited space to splice it in.