Well, it seems that is not the sole problem. Now I am getting intermittent power from the alternator. I put regulator on; and started engine and after few seconds the light went out and staid out. Then 20 min later I went to drive away (75mile trip); the light stayed on. With it running, I unplugged regulator. When I did so, a large spark shot out like it was carrying a load, and the engine idle speed increased (Light stayed on); plugged it back in, engine speed did not change, no spark and light continued on. I proceeded on trip, 1/2 mile down road light went out. However I was smelling a strong burning wire smell. Pulled over, could not find any damaged wires or source of smell; continued on trip. 60 miles down road, stopped for bag of ice, left engine running to hopefully not disturb charging, however got back in truck and light was on again. Proceeded on trip as dark was approaching, when it baca me too dark to drive w/out headlights
, I would turn them on when approaching curves or hills, (I was traveling country roads). Last couple miles in heavy woods had to run headlights, they were very dim.
This am put big battery charger on high for 30 mins, then med for 30 min; started truck w charger on, light was off. Had to drive to town (8mi one way) light never went off this time I started, made three stops and light never went out every time I started or stopped.
Now, back to square one; don't know what to do.