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Overdrive problems

If your 740 is a wagon, the yellow relay may be the rear wiper relay.

It's that white '90 744Ti that he's owned for the past 10 years. So, unlike the red 745Ti that I own, there's only one wiper relay, that being the skinny french Cartier 1235067 relay for the front.
 
Hmmm, but my OD worked.., but maybe I lost the proper relay and got them mixed up. EDIT: Dammit, just found the proper one!
 
OP: if in the end you decide to replace the switch, I suggest you put a jack under the transmission then loosen or remove the bolts holding the rear transmission support to allow you to lower the transmission an inch or two to give you easier access to the switch.

It's really tight in there otherwise, and lowering the transmission a bit won't hurt anything and makes the job much easier.
 
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