Re: Excited wire
Probably what happen when you connect the alternator wire to the ignition switch, you connected it to the run circuit and not the ACC circuit. If this happen the power from the alternator is bypassing the ignition switch and feeding the ignition system directly.
From the information I have and not knowing exactly what alternator your installing:
Your brown wire (that came off of the old regulator) should go to the generator light. You can test this with the ignition in the run position, with the help of an assistance, by momentary grounding (for less than a second) the wire, this will make the GEN light flash on. This wire should connect to terminal 4 on the new regulator. Provided the light had works properly with the generator, otherwise you may have other issue.
The red wire (that came off the old regulator) should go to terminal 3 on the new regulator.
The 2 terminal on the new regulator should go to the R terminal on the alternator.
The F terminal on the new regulator should go to the F terminal on the alternator.
If you are installing something larger than a 35 amp alternator then some of your wires will not be big enough gauge to carry the current. The charging system wiring will then need to be updated.
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