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Old 02-19-2019, 02:26 PM   #6
John V
No more BMWs
 
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Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
Can you do some swap-tronics to diagnose it?

I.e. move the igniter over from the right headlight to the left and vice versa and see if the problem moves. If not, do the same with the ballast. If not, do the same with the bulb. Eventually you'll find the dodgy component.

If the igniter / ballast is built into the light, obviously you can't do this.
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