Well, I have aquick question for all of you:

Our tow vehicle shows some sign of an electrical issue. There is a autometer volt meter gauge in the truck, when we start the truck up there is over 13 volts on the battery, no problems there. As soon as we put it in gear, the voltage drops to around 11 volts. We have put a new alternator in it about 1year ago. I am wondering if it could be an electrical issue with the wire that goes to the transimission (forgot what its for). It is a 1973 chevy 3/4 ton truck, 400 transmission.

I have an ext regulated 100 amp alt with a deep groove pulley. With my electric fans on it will show a drop in voltage from idle in neutral to idle in gear. If you have a small stock pulley this shouldn't happen. Perhaps the regulator is at fault.

Bill,

What about once your in gear and you start moving again, ours doesn't move off of 11V once in gear, no matter how fast your going. So it is obviously load related. That is what doesn't make sense.