Wow, this is the same problem I am having with my 98 S90 (218K Original motor). I read in another forum that they guy replaced all four of the turn signal lights, and fixed it.
I have replaced the hazard/turnsignal relay/switch.
I pulled and tested the turn signal switch and it tested out ok.
I pulled the turn signalfuses, and the right turn signal still persisted.
Then I noticed that when I turned on the headlight switch when off into "Parking" mode, the right turn signal would come on solid.
I was beginning to be worried that I had a murned out breadboard under the relays, or wiring that went bad.
Thanks for posting. I will check this out today!!! We'll let you all know!
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