Stop in for a cup of coffee

dukeboy_318 said

im thinking of the load draw when the vehicle is charging vs not charging?

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Simpler than that. Its the amps flowing out of the battery.

Putting it together, the ammeter shows current flowing into or out of the battery.

When it points to D the battery is discharging. Some load is drawing power, and curent is flowing to ground through the ammeter.