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Overdrive questions 200 1988

Sorry, I forgot about the jumper. I've not used one, and I don't know what you jumpered.


The wiring for the solenoid is separate from the wiring for the light. So you can have the light behaving normally and still have the O/D not engage.

Assuming that you have an automatic tranny:

At first start-up, the relay engages and the up-arrow should not light up. In this default condition, the tranny should engage the O/D automatically when throttle position and road speed are appropriate. Level road, 35 to 40 mph.

Pushing the button on the side of the shifter knob opens the relay. This brings on the up-arrow and de-powers the O/D solenoid causing the O/D to disengage. Thus the up-arrow shows that the O/D is inhibited from engaging.

I have "tested" the O/D solenoid by listening. With the engine not running but the key in II position, one can listen under the car (about under the driver's seat) while pushing the inhibitor button. The solenoid should click with each push.

If it doesn't click, first be sure the wire that brings it power is OK. Check for a bad connector, wire melted from lying on the hot tranny case, wire cut where it passes up through the shifter well into the cabin, and properly connected on a connector under the carpet near the right side corner of the central control panel cover. The wire is white, connects to pin #87 on the relay.

Sounds like a lot of work, but may save the cost of a new relay. If it is the relay, you might try re-soldering the circuit board before buying one. It is not an inexpensive relay.

Hope this gets you on the road OK.

Good Luck,

Bob

:>)




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New Overdrive questions [200][1988]
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