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OD operation involves 4 components and the wiring that connects them...
1) Fuse 11 (200) or 12 (700/900) supplies voltage to items #2, #3, and #4.
2) The Shifter button/switch turns the OD relay off and on (many drivers don't use it or know what it does).
3) The OD relay controls the OD solenoid and the Upshift ("OD off") Arrow light (separate wires). When the Arrow light is ON, the OD relay and solenoid are OFF.
4) The OD solenoid allows OD engagement when ON (energized), (this is the "default" OD relay/solenoid state at start-up)
If your shifter switch makes the Arrow light go on and off, then the OD relay is working (although it could still be failing to control solenoid voltage due to burnt contact points).
If Arrow light doesn't go on and off, start with the Fuse. If fuse is OK, suspect shifter switch or wiring to the relay—check for Key-On voltage at relay plug terminal 15 (blue and gray wires). If voltage is OK at 15, check for voltage at 86 (gray) when shifter switch is depressed. If 15 and 86 check OK, the relay is bad.
Otherwise, the problem is most likely the white undercar wire from OD relay to Solenoid (#4 above) or the wire connector terminal at the solenoid.
Less likely would be be Solenoid itself.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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