Faria 2" Heavy-Duty Ammeter (60-0-60) - Black 
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2" Heavy-Duty Ammeter (60-0-60) - Black
An ammeter indicates the current flow through the battery charging system. A "zero center" ammeter, during chargine, shows a (+) positive reading indicating the current is flowing to the battery (charge). A (-) negative reading indicates current flowing away from the battery (discharge).
Faria Performance Tips:
Wiring - Due to the high current loads present in many ammeter applications, ammeters must be wired with wire not lighter than 10 AWG approved for Marine use.