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Re: 12Si Alternator Install Diode with Battery Gauge
Quote:
Originally Posted by andrewpclayton
That image shows a connection from the nut on the alternator to the junction box in addition to the #2... am I seeing that correctly? That might could explain it!
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The no. 2 wire has to supply the current to the alternator fields as the regulator reads the system. The brown wire just turns on the alternator and it reads the voltage carried by the no. 2 wire. So yes if you don't have the no. connected to a full time 12 volt supply (junction block) the alternator fields will not become more magnetic which increases and decreases the alternator output. The battery voltage must be applied to the no.2 wire to allow the alternator to maintain the 14.5 volts it needs to power the system and charge the battery.
Think of the regulator as a water valve and the no. 2 wire as the supply hose. If you need more water from the supply hose the regulator opens more and lets the alternator pump more juice to the system.
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