In some installations of older alternators with remote regulator the extra field wire is used to illuminate the charging indicator lamp on the dash. That's why the line goes up to the panel area. When the key is on, but engine not running, there is 12V to the field wire, but the other end is not excited. Once the engine is started, and the field wire is energized, the 12V appears on both sides of the lamp, and it is not lit.
You do not need it, unless you want to have a charging indicator on the dash.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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