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1981 M46 OD Question - Follow-up 200 1981

posted by  Don Foster on  Wed Dec 25 13:10 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

"I'm assuming the battery needs to be installed with the key on, and the red wire connected to switch for the test?"

Not for a continuity test. Check continuity to ground at the switch (wire unplugged) as you or a helper shifts the tranny in 'n outta fourth gear. The switch should show continuity (0 ohms) to the tranny case in fourth and infinite ohms in any other gear.

An alternative approach is to jump the wire to ground, which "enables" the OD relay constantly. This is just as if the switch had properly switched. Then drive the car, and see if the OD problem persists or is gone.

Be very careful to use OD only in fourth gear. In particular, be aware that OD can attempt to engage in reverse, and it may do serious damage to itself if it engages. Thus, be sure OD is disengaged except in fourth for your test.
--
Don Foster (near Cape Cod, MA)






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