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OD operation involves 4 components and the wiring that connects them...
1) Fuse 11 (200) supplies voltage to items #2, #3, and #4.
2) The Shifter button/switch turns the OD relay off and on
3) The OD relay controls the Upshift ("OD off") Arrow light and the OD solenoid (separate wires). When the Arrow light is ON, the relay and solenoid are OFF
4) The OD solenoid allows OD engagement when ON, (the "default" OD relay/solenoid state at Key On)
If your shifter switch makes the Arrow light go on and off, then the OD relay is working, and the problem is most likely the undercar wire to the Solenoid (#4), the wire connector at the solenoid, or the solenoid itself.
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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