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Then I would look for a connector that is not all the way plugged in. It might look like it is but not so when you turn it pulls it's self apart just enough to loose contact.
Just a thought, but maybe when you turn the steering wheel the linkage is somehow causing an interuption in the ground. You might want to check your negative lead from the battery for corosion or the seath being worn. It is a way out there idea, but it is worth checking. Along with if there is any binding/rubing on any part of the elctrical harness around the PS.
The only thing I can think of is that I just replaced the pressure switch on the PS on Saturday, the sensor lead looked a little ragged but I didn't see anywhere that there was binding or stripped insulation. The battery cables are new (within the last 2 months) since I replaced those when I did my last plug/distributor replacement and the problem has been going on longer than that.
The thing that makes me think it's a problem in the steering column itself, rather than in the steering gear, etc. is that I can hear a plastic-on-plastic rubbing from time to time, right near where the wheel meets the column, but I've had it apart and can't see anything rubbing or any sign of problems on any of the components (or the plastic itself, as a matter of fact).
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