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4th Gear Switch on M46 - Where is it in this attached photo? 200 1981

My overdrive suddenly quit. Switch tests good, and I replaced the OD relay with another. Dash light does not come on at all, and no click heard from relay. Duane (ODGuru) indicated in the FAQ that these symptoms indicate a bad 4th gear switch, located on the top of the gearbox. I have a spare gearbox from a '79 laying around that I can get a switch from. I need help identifying which switch is the 4th gear switch. Photo shows top view of an M46 gearbox. Clutch housing is to the right. Which switch is the 4th gear switch? What does the other wire go to, and control?

Jim Egelston - Seattle
'81 245DL, '85 244GL, '94 945T, '89 535i, '74 R90S







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