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A bit more on OD operation/indications 900

uid 18083's pic
posted by  lucid on  Tue Jan 22 01:57 CST 2008
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

Dave said, "When using the overdrive button on the back side of the gear selector, the arrow in the instrument panel should immediately light (or go out). If not then either the overdrive relay is faulty (or loose) or the overdrive switch wiring that comes out the bottom of the shift lever is broken or the overdrive button is dirty."

To the 2nd sentence I would add "Fuse 12", which powers the OD relay and solenoid, but not the Arrow light. That means a blown fuse 12 will keep the light on and the tranny in 3rd. This is because the light has a permanent +12V at the cluster, but grounds thru the OD relay in the "off (or inoperative) state".

Fuse 12 can blow if the OD solenoid wire gets chafed and shorts to ground as it exits the tunnel area and/or as it runs back under the car to the solenoid. If it doesn't blow, the OD relay can act as a "fusible link".
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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