Most autmotive and heavy current ammeters have a shunting bar that
connects the two terminals. It might have a slight resistance in it that
the ammeter will register the needle with. At least that's the way they
are designed to work. An ammeter is actually just a voltmeter with a
calibrated set full throw distance (say 100 mA at 12 volts). If it's known
that 100 mA of current going through the windings of the ammeter will make
it through full needle movement, then you would need to have a set
resistance on the shunt that would create a voltage drop of equal value.
Anyways you don't really need to know that. Just solder your wires to
good quality mechanical connectors and use those with the meter. Any
resistance due to a poor connection robs you of power. Solder is the only
sure method. Use only rosin core solder, never acid core for electrical
connections.
-Vegaman Dan
-66/69 Spitui!
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