Hi Maxozone,

I am assuming that you are asking about a 12VDC system since you did not specify. The excitation circuit has either the charge light or a resister in series with the battery voltage. Some installations have both (the resister supplying the current in the event that the charge lamp opens/burns out). If it has both in will be a series/parallel configuration. The required voltage at the regulator for the excitation circuit is 1.3 to 2.5 volts and requires a potential current flow of 2 to 4 amps.

I hope that this what you were looking for.

Good luck,

Dragonfly