Originally Posted by
V10Touareg
I have a Redarc electric brake controller (on dashboard), which sends the right signals, with or without electric brakes on towed items. I also have an intermediate unit for LEDs on towed items.
A dealer (hopefully), or a good Indie will wire the vehicle correctly, the first time - diodes are required if you don't have an electric brake controller or the intermediate unit that I spoke of earlier.
Some installers will wire simply, then cancel scan codes permanently meaning that future problems will be masked.
My ride can tell if any bulb on a towed item is U/S.