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I see V8SHO.com lists a TSB for the multifunction switch on '99s:
99-24-3 ISSUE: The front windshield wipers may operate while the multifunction switch is in the OFF position on some vehicles. This may be caused by a resistance drift in the multifunction switch or a partially plugged-in connector.
This is exactly what is happening to my vehicle (specifically when the wheel is turned left, the wipers go). I don't see anywhere on the site how to fix this though (just instructions for replacing the switch)....is there a fix for this 'resistance drift' beyond just replacing the entire unit?
'99 ES welded, 63k
The only "fix" is to replace the MFS with an improved redesigned switch. Motorcraft part SW-5585, Ford part XF1Z-13K359-AAC. These two parts are identical. To save some money, find a parts store that sells Motorcraft.
Doh! Any idea on prices?
List price on the Ford part is $90.58. From www.Fordpartsnetwork.com $76.09. You should be able to get it from a parts store for @ $50-$60.
www.Rockauto.com has them for 49.79. just search for the number.