Resistance / Continuity Measurements:

25 ohms from the battery negative post (not the connector) to an unpainted nut on the chassis located nearby under the seat.

35 ohms from battery negative to an exhaust manifold bolt, using a pair of jumper cables as an extension (cable read basically zero resistance).

Other Observations:

Grounding strap from chassis to bell housing looks nice and dry, no corrosion, and it is on tight. Measured resistance between bell housing (within 1 inch of ground strap mount) and chassis (at sway bar bracket) and there is virtually no resistance.

Alternator connectors and wiring look great, no corrosion whatsoever, and insulating material looks pretty good.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280