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850 lowbeam failure 850 1994

1994 850 turbo wagon
The left side lowbeam quit recently so I tried a new bulb, in fact I tried three new bulbs but still no luck. The fuse is still OK. I still have 12V at the socket, so I've run out of ideas. The socket admittedly does look rather burnt, but it has for several years anyway.
The old bulb and all the new ones I tried measured at about 0.25 ohms cold. 50W at 12V should be 2-3 ohms but that's when they're hot so these bulbs look OK to me.
Any other suggestions?
Thanks for any help I can get.

Malcolm






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