Range Rover and Caravan Brake Lights

I had a similar problem some years ago with a German manufactured tow car who were also stumped as to why it wasn’t working properly, so I took it to a tow bar fitter and they fitted a resistor (or something like that) into the wiring loom. Everything worked fine, so maybe try a local company near to you? Good luck

Thanks Extugger, but I am pleased to report that it was suggested that as the caravan has four rear brake lights, two low down and two at the top that the wattage was more than the sensitive system in the car

liked and therefore thought it a fault so didn't work.  We removed bulbs from top lights and hey presto the lower ones work properly. 

It will be worth checking the law if you intend leaving the bulbs out as I feel it could be a case of "must work if fitted". Someone else may know more on that aspect.

Have you tried fitting a pair of LED bulbs to the upper brake lights? They draw little current.

A quick glance at your RR handbook would have confirmed the maximum brake lamp wattage to be 60 watts, four conventional brake lamps would be approx 84 watts.

EmilysDad's idea seems worth a try.

The same scenario here when we got a new Discovery three years ago. We got as far as buying a trailer board and threading the cables through the caravan windows, when I read somewhere about the top lights. Bingo! It is also a Senator 2005.

The resistor in series with the lamps would limit the current the same as fitting lower wattage or LED bulbs or removing the upper bulbs,