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The L and IG wires are not the same wires as your GQ they are two different wires.
The L connects to the warning light in the dash (white wire red trace) as well as the auto choke and FPCU.
The IG is the sense wire (white wire) that from factory connects into the main B+ white wire about six inches from the alternator.
ET has explained why/what is happening with 1&2.
Inside the regulator there is a processor, possible a couple of switching transistor, a few diodes and a zener diode from memory.
When the ignition is turned on current flows through the alternator warning light in the dash down through the alternator regulator. This turns the warning on as well as the alternator regulator.
Once the alternator is charging the voltage at the alternator warning light terminal (L) raises to charging rate (say 14 volts). This puts the same potential on both sides of the alternator warning light in the dash (14 volts both sides) so current doesn't flow so the warning light is turned off.
The alternator regulator measures the voltage on the sense wire and constant switches on and off the field circuit to maintain the voltage at it's set level. The higher the electrical demand the lower the voltage the longer the field circuit is held on by the regulator.
Last edited by Yendor; 11th June 2016 at 10:30 AM.
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