LED lights use less power than normal bulbs and this can cause problems with the sensing and control gear on some moden cars.You can get a resistor to to go in parallel with the LED bulbs so they have the same power draw (wattage) as a normal bulb,also I belive that you can get LED bulbs with these built in.
I do not know if this is a problem with volvo's or not.The car may not detect that the indercators are working on the caravan through.
Regards Rogerb
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