The contact burning that is very common on brake and tail lamps is not so common on turn signal lamps. They rarely get hot enough to cause this issues, due to the intermittent nature of their operation.

But yeah, it's the first thing I'd check too!

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)