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2015 150 Supersport (new)

Had all battery cables off battery while working on new boat (added courtesy lighting, compass (lighted), USB outlet, depth finder, all on a fused switch panel).

Prior to reconnecting battery, got out the multimeter to check my work.

All looked great until I got to the battery. The two large cables, positive & negative, for the motor, had a "partial" short. It measured 20,000 ohms.

I'm thinking this is right up into the motor, the alternator (generator?) or some similar circuitry or equipment.

But a connection is s connection ... and I fear my battery will be draining (or worse).

Anybody know what's going on?

Just to be sure, I have a master cutoff of positive power between battery and fused switch panel (reading is the same on or off). Also, I did not modify any wiring except in the console, where the positive and negative wires originally "landed" at the 12v outlet as their first stop.