2010 Ford Focus 1.6tdci
Headlight bulb always blows

william smith
51 points

Problem added: Nov 13, 2017 (3 years ago)
The passenger headlight bulb is constantly blowing say ever 3 months. All other bulbs are fine in fact they have never blown since I have owned the car just this damn left side one. I always buy quality bulbs never touch the bulb so maybe a wiring problem somewhere or is there a fuse I could check replace. The car is mk2 face-lift focus. As said all other bulbs never blown and not starting to bug the hell out of me.

Car details
Car: Ford Focus
Variant: 1.6tdci
Model Year: 2010
Category: Electrics, ECU, Warnings & Lights
Replies and Fixes
1,890 points

Nov 14, 2017 (3 years ago)
Usually it can be figured out by looking carefully at the bulb/lens/filament.
But without that check the actual bulb wiring connector.
Is it heat damaged?
Are the terminals good and tight with no discolouration?
But back to my original point,
Is there any colour on the lens
Or is the filament broken off inside?
Careful observation needed here!
william smith
51 points

Nov 15, 2017 (3 years ago)
Seems a bit silly now I think about it but I usually just bin the old bulbs but memory does tell me that the filament is like a white ish colour like too hot so I guess too much juice is getting to it at random times. The connection to the headlight unit is solid but only the head light fixing itself the locking clip has a bit missing but it doesn't really move. Again from what I remember the headlight bulb holder has 4 wires attached and I believe 2 are resistor wires so maybe these playing up maybe?? Cheers.
1,726 points

Nov 17, 2017 (3 years ago)
could be a bad earth
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