New here and just recently picked up my 7Ton, all the lights function except the brake lights. I have been all around the vehicle looking for the switch that turns on the brake lights. The closest I have come is a Kissling 26.56.08 relay located under the dash, behind the steering column and above the Bendix E-7 dual cylinder brake valve. Correct me if I am wrong but the only reason I doubt that Kissling relay is not it is because it has to have the ignition in the ON position for it to receive power (I believe the brake lights should work with just the battery switch ON).