Blue Sea Systems 8252 DC Ammeter - 50-0-50A with Shunt - Manual (Page 2)

4. Connections (continued)
In many situations it will require a thoughtful analysis by the boater to
determine exactly where to place the ammeter sensing shunt in a cir-
cuit to obtain the current fl ow information that is sought. As illustrated in
the initial example, it may sometimes be necessary to place the shunt
in the negative wire of the circuit to be able to isolate the exact current
value that is desired. The shunt can be placed in either the positive or
negative line. Assuming one positive wire from voltage source to load
and one negative wire returning to the voltage source, the amperage is
always exactly the same in both the positive and the negative wire.
Marine Electrical Products
Wiring Diagram
Zero Center Ammeter
Installation (continued)