An alternator has a power out wire a smaller power in wire to excite the field, a ground wire for the field and a large ground wire. Most ground wires are brown. And most power wires are red. You check check the wire for ground and power with and ohm/volt meter. Put the voltmeter on volts and connect the black wire from the meter to ground and the red to the wire, turn on the key and if you have volts it is a power wire. If no volts the turn the key off, select ohms and attach the black meter wire to ground (such as the frame or any metal) then attach the red wire to your blue/white wire if you show 0 ohms or low ohms then it is a ground.
SOURCE: Honda S2000 engine installed in kit car. How do I wire alternator
Unfortunately the Honda alternator is regulated by the ECU, which allows the ECU to intelligently reduce alternator engine loading to improve fuel consumption. The intelligent system uses an electrical load detector (ELD) located near the battery to control the alternator output voltage. A two wire alternator has an inbuilt regulator that will always generate the required charging voltage. When a battery is fully charged and the electrical loading is low there is no need for generating the charging voltage, in this situation the honda alternator will reduce the output voltage to reduce engine loading, hence improved fuel economy.
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