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1992 Cutlass Ciera electrical issues

Main issue: the passenger window no longer works. Thankfully, in a MI winter it died while it was up. The driver’s side mechanism went first, then about a day later, the passenger mechanism went. All of the other automatic windows work fine. Minor issues: turn signals rotate working properly. Manual operation is fine. Speedometer occasionally jumps all over the place. What is going on?

The most common problems for this kind of thing is dirty switch contacts and broken wires in the door jam caused by stress to the wires.