Contact George Murphy at Performance Analysis 865-482-9175. He can send you a detailed printout on testing these systems. The servo can be tested by simply plugging the wires in and using an ohm meter. He is THE EXPERT on this stuff. He also sells rebuilt units with a one year free replacement warranty a $100 repair after that. Hope this helps.

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Cars:
1993 400E
1993 300TE Wagon
1985 300D Turbodiesel w/ 688,000 Miles On Original Eng/Trans
1979 300SD
1977 Euro 6.9
1967 230S IMA Universal Wagon
100 Or So Parts Cars

You Cannot Change your Future Without Disturbing Your Present

It Looks A Whole Lot More Like It Did Today Than It Did Yesterday?