I re-read your reply to my first posting regarding the actuator. I DID clean the engine a couple of times (some minor layers of crudding in the "bay") and used the garden hose to spray off the cleaning solution. Additionally, we've had a couple of rain storms... Moisture, yes. Besides, I live near the CA. coast (Pacific ocean is less than 2 miles from the house "as the crow flies"...)
How I determine which unit has gone bad? Any suggestions on how to trouble-shoot this? I'm not an electrical engineer so don't start with the VOM analysis (I have one but don't really know how to use it much).
1989 300 E
1992 190-E 2.3