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Jack E/NJ · 03-25-2015, 03:13 PM

Briefly, if you only want to know how much current is going in to or out of the battery, then only the battery terminal is connected to one side of the ammeter. The alternator output post and all other wires (ignition switch, lites etc) are connected to the other side of the ammeter.

BTW, the standard 3-terminal 10si and 12si GM alternators can be easily converted to one-wires by simply connecting the #2 terminal to the alternator output post with a small wire and leaving the #1 terminal disconnected.

Jack E/NJ

PS: Use at least 10ga wire from the alternator output post to the ammeter and from the ammeter to the battery.

03-25-2015, 03:13 PM	#5
Jack E/NJ Senior Member Join Date: May 2010 Posts: 2,259	Re: One wire alternator ? Briefly, if you only want to know how much current is going in to or out of the battery, then only the battery terminal is connected to one side of the ammeter. The alternator output post and all other wires (ignition switch, lites etc) are connected to the other side of the ammeter. BTW, the standard 3-terminal 10si and 12si GM alternators can be easily converted to one-wires by simply connecting the #2 terminal to the alternator output post with a small wire and leaving the #1 terminal disconnected. Jack E/NJ PS: Use at least 10ga wire from the alternator output post to the ammeter and from the ammeter to the battery.