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I am having a similiar problem. When I want to make a left turn, after about 2 blinks the bulb out indicator comes on. I have chasing a ground problem in the left front ground block for some time. At one point last week, if you turned on the headlights all of the wipers would come on. After cleaning the ground block that stopped happening. Sort of. Now the bulb out indicator comes on only when the left directional is on. Also if I flash to pass, the rear wiper still does one swipe. I am going to replace the spade connector for the light ground in that corner since I couldn't really clean it. It is still somewhat corroded.
In short, check the grounds if you are sure the bulbs are the same type and installed correctly. Volvo loves using common ground blocks. There is one in each of the front corners and at the bottom of each A pillar inside behind the kick panels and I believe the tail lights are grounded directly to the chassis in back (maybe someone else can verify this). Also look for a light that is dimmer than its twin, it might be a bad bulb.
Just my 2cents.
-Chris
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