If I recall the control of the starter is in the cycle module (N65) which is part of the side of the electrical center. It of course must see either neutral or park and probably a security release. But direct power to the 50 term on the starter comes from a relay within this module. Do you have power on term 50 of the starter?

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician