Brake Light Wire?
 

Have a 2000 250SD and just added a used topper w/ the high brake light. Was wondering were to pick up the "brake only hot wire" don't want it to blink when I make a turn.

Thanks

at the end of tail light harness on left side frame rail will be a wire taped up marked for high mount stop light

Thanks for the info, I'll check it out tonight.

rbaker has you covered pretty well. On mine it right by the bumper, on the drivers side. It was a green wire, and said "center high mount stop lamp", or "CHMSL" on a little white piece of tape on the wire.