OKAY, if you have a voltmeter YES it will give you some indication of charging, just setting not running the battery voltage should be around 12.6 volts but once running at fast RPM it should rise to the 13.5 to 14.7 or so range depending on the alternators regulation and the battery.
You could wire a switches BAT INPUT (12 gauge is plenty big enough) fed off the big battery cable where it attaches to the starter switch/solenoid input.......have its swtiched OUTPUT wired to + on the voltmeter........the voltmeter - wired to case frame ground........another wire off the switches switched OUTPUT with an in line series 10 ohm resistor down to the Alternators 1R Excitation terminal. Turn it on and the voltmeter will read battery voltage plus excite the alternator and turn off when not running.
Usually loads like lights are fed off the load side of an ammeter but if you have no ammeter Id wire a 20 amp in line fuze and 12 gauge wire again from the big battery cakle at starter switch/solenoid input up to the BAT INPUT light switch terminal.
The alternators big main output can wire with 10 gauge wire to the batery cable identified above. If its a GM 10 SI 3 wire alternator its other small 2F terminal wires to its big main output post.
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