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Do you have a tow bar fitted? Sounds like a wiring problem earth short usually a badly wired in tow bar can cause it as they wire them into the light cluster using scotch locks they need soldering properly. Failing that or no tow bar fitted have you got water ingress in the lights Definately sounds like the rears
any other electrical faults? any aftermarket electrical equipment been fitted about the same time as the light problems?(phone chargers, Sat nav', etc.-remove temporarily to make sure they are not interfering with operation of electrics) are you sure all the bulbs fitted are the correct type - a twin filament bulb fitted where a single should be perhaps? maybe remove any bulbs fitted recently and see what happens. poor battery condition/low voltage/dirty connections at battery or earth wires can cause electrical problems like this. give more details of vehicle - year, model, spec etc. and say if problem is intermittent or every time you use the brake +/or the indicator. if you have a tow bar and trailer light socket fitted to it water entry into the socket could be the problem.
Just tap off of the rear lights , You can do most of the wiring on one side and only have to tap the indicator off the other side. shouldn't need a relay unless you have lots n lots of lights on the tailer. Hope this helps.