I had my donated int reg alternator tested at AutoZone and it was dead. This contributed to battery drain over night while sitting. My question is this. I am purchasing an equivilent internal reg alternator to what I had. I have a M&H voltage reg. bypass plug also in place. When I test my wires my blue ,I beleive, is for my idiot light. That's dead which is normal. I have a red from the horn relay which has 12.5v to my power connection on the alt. I also have a white wire which reads 12.5v. According to my diagram from this site they suggest jumping from the red to this termianl on the alt. What does this white powered wire do? I just don't want to fry my alt! thanks for any advice.