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If they're both not working, I would think a good place to start is the earth return wire? You can do a quick check with a cheap multimeter. With power off check the earth return side, by clipping one of the meter terminals with a crocodile clip onto a piece of the metal bodywork and try each of the terminals with the other meter probe, you would expect one of the lamp base contacts to show a very low amount of Ohms to earth.
If they are both OK, then you can switch the multimeter to DC volts and check the supply voltage coming into the lamp contact base [after switching on sidelights]
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