There are tons of sites out there offering flashing brake products. I looked through a few and went with kahtec.com. I picked up the "Blinking Smart Stop - Delay Version" for $23.
Included in the packageThe difference between the basic unit and the delay unit is that with the delay the brake light won't flash again if the brake is applied within 10 seconds. This is good if you're stuck in bumper to bumper traffic and don't want to constantly be flashing the driver behind you.
Installation of the unit is pretty straight forward. Take the two screws (torx 20) out of the brake light to remove the lens, set the lens aside and then pry the actual light housing away from the truck. The black sticky foam that holds housing to the truck, and I assume waterproofs it, takes a bit of force to separate. With a cloth laid down to protect the paint I used a screwdriver to pry the housing lose.
The installation instructions, which can be found here, mention using the quick connectors that come along in the package to tap into the stock wires. The quick connectors are crap. I tried using them as the instructions said but had no luck with them so I just cut and stripped the wires like normal and attached everything. Useful info: the green/white wire is your positive and the tan/black your negative. As you can see I made sure to butcher the wires on the light housing side of the factory connector. If something goes wrong it's easier to replace the light housing portion instead of the wiring throughout the truck.Housing pulled away from truck
Having destroyed the black sticky foam upon removing the housing I was worried about possible leaking behind the light. I reassembled everything and then slowly poured a bucket of water directly onto the light. Took everything back apart to check for moisture and not a drop of water got through. I'm guessing that since part of the foam was left on the truck and the other part left on the light housing, they joined back up nicely to recreate a seal.Cut up the part that's easier to replace
And with a quick test you can see what those driving behind you will now see:
If you have any questions, comments, or concerns just let me know.