Headlight ballast resistors

Fmaclennan

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Hi Guys,
just changed my Zenon headlight bulbs to new Osram ones spent a fortune on them! problem now is one of the lights stopped working after 3 days. checked the bulb and that's fine, could it be the ballast resistor that's on the bottom of the headlight? if so where is the cheapest place to get them and are all A5 ones the same?
Seen some from £28 would they be ok?