I'm going to ask, even though I'm pretty sure I know the answer.

To wire a topper 3rd brake light on a 2006, I have to piggyback the stock 3rd brake light wiring in the cab to the provided brake light wiring of the topper, correct?

There doesn't seem to be a "solid" brake wire available at the rear of the truck. Someone please correct me. I don't mind wiring, and i'm good at it, but i'd rather the simple solution.

Anyone?

 

tap the correct wire in the tail light that triggers the brake light. should be 3 wire hook up in tail light, ground, brake, signal. may take some trial and error but its doable. or if you have a test light, start poking lol

 

I wish it were that simple. The signal light overrides the brake light. I'm looking for a constant brake feed.

Some people have said there is, and others say there isn't but nothing I've read was clear on what year had what, and where to find it.

 

Two ways, one as you said off the third brake light or tap off the brake light switch by the brake pedal.

You might find the wire under the driver's seat for the third brake light.
For the brake switch... one of the "one to two wire" taps and some slide on lugs, not the scotch locks but just the tap that is made of metal.

I converted my Brake/Directionals to two separate lights.
Ran a new brake wire from the pedal switch to the back for the brakes.

 

I'm old, lazy, & cheap. I got a connector that matched the trailer hitch plug and used that. Got another male/female connector set, and wired it inside the topper and slid the whole thing down inside the plastic bedliner in the corner of the bed to prevent damage. This way I can unhook the connector at the topper and pull the topper. Can also unhook the connector at the trailer hitch and pull the bed without having to unwire anything. Used the parking light wire to hook-up the interior light on the topper (have to turn on parking lights to be able to use the interior light). Since the turn signal and brake light are the same wires, had to buy a logic box (#E20-702) from Truck Outfitters Plus off the internet for $22 and wire it in line so the turn signals wouldn't flash the topper brake light. Figured if I ever got a hitch ball and wanted to haul something, I'd just unplug the connector at the hitch connector and go without the 3rd brake light since the trailer would have brake lights (again without having to unwire anything).