The ground point on W3 and W9 checks out. With the hazards on, I checked for voltage on the rear driver turn signal wire harness socket and I was registering zero volts. The other rear lights were registering 12V. So, I have zero voltage on that particular turn signal pin. Where does the other side of the rear tail light wire harness connect to? Possible bad fuse or relay?

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI