Trace = Less than 1 ohm.

If you have a set of jumper cables, hook one from the battery neg to the engine block, and the other from the block to a good chassis spot.
That assure both engine and chassis have ground reference to bat neg.

If that gets you a better ground reading, you know you have a poor ground..which means check all brown ground wires.

Don't be too concerned about the 1.3K I gave you, as that came off an E class rig.

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A Dalton