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my mistake - the cruise cotrol and speedometer do have some reliance on one-another
consulation with wiring diagram (page 138 & 139 of 1981 greenbook wiring diagram) indicates there is a speed pick-up coil within the speedometer (two individual wires exiting to the right of speedo cable input)
the AHA moment comes - speedometer fluctuation sets in and then the cruise acts up as a result
suspect, then, that imminent replacement of speedometer cable will solve this issue
i should fear not the wiring diagram
--
rich - '85 244DL with 323k
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