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Headlight Not The Bulb (Again)


DamianH
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O Learned Denizens, only my second post to your hallowed halls so please go easy on me.

2010 XF with halogen H7 headlight bulbs. Right hand failed a few months ago and I changed it without incident, apart from cursing the person who signed off that delicate tab on the top, which was pre-fractured of course. So I am notionally capable of changing a Bulb.

Left hand just failed, replaced the Bulb, no joy. Reading in the manual I see there are no fuses but instead a Field Effect Transistor protection.

So now I am baffled what to do next. Any pointers?

I'm OK with a multimeter but I need to know physically where I am pointing the multimeter and what a happy multimeter looks like.

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Ah-ha!

Got the multimeter out today and patiently pinged everything through. Upon doing so, I discovered that in turning the headlight over I had foxed myself and swapped out the high beam Bulb instead of the low beam. I hadn't thrown the old Bulb away - because I thought it looked like a good one - so I just reversed my error and swapped the real blown Bulb

Crisis averted! And some kind of lesson in hubris; it will teach me not to claim I can change a bulb again. 😉

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