Re: ammeter or voltage gauge
The OE ammeter is a millivoltmeter and indicates the millivolt difference from each end of the wire from the horn relay buss bar to the battery junction block.
The polarity of the voltage when current flows determines whether the gauge shows a discharge or charge.
If there is no current draw in either direction, the ammeter reads 0, middle scale.
Turn on ignition and should show a discharge with alternator off, not running.
If you connect one side of the ammeter to power feed at the fuse panel more action will be shown on the OE ammeter because of added length of wire, length being the wire from the horn relay buss bar to fuse panel along with the firewall connector.
Whether or not you have a one-wire alt, three-wire alt internal reg'd, or OE ext reg'd alt, the OE ammeter is a separate circuit unto itself.
A separate voltmeter can be added and connected to the IGN spade on the fuse panel and a good ground, your choice.
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