bouncing volt and ammeter
Have your charging system checked at the auto parts store (free). you might have a bad diode or two in your alt.
BUT..
I had the same issue. The pulley on my Alt was ~3in dia and parts book called for smaller dia (2.5 to 2.75 if memory serves me) smaller Dia = faster Alt speed and more ability to charge at idle. I changed the Alt to one that had the smaller dia pulley, now my ammeter and voltage is rock solid at idle.
I can not say if it was the pulley or the alt but physics says the pulley did the trick.
I did some math... (feel free to correct me if i'm wrong) I arbatrailery chose 6 inch Dia for crank pulley and 3 and 2.5 for alt pulley just to illustrate the point.
from link above, notice the turn on alt speed. Also the amperages listed are what the alt CAN do not what it always does in terms of output.
Have your charging system checked at the auto parts store (free). you might have a bad diode or two in your alt.
BUT..
I had the same issue. The pulley on my Alt was ~3in dia and parts book called for smaller dia (2.5 to 2.75 if memory serves me) smaller Dia = faster Alt speed and more ability to charge at idle. I changed the Alt to one that had the smaller dia pulley, now my ammeter and voltage is rock solid at idle.
I can not say if it was the pulley or the alt but physics says the pulley did the trick.
I did some math... (feel free to correct me if i'm wrong) I arbatrailery chose 6 inch Dia for crank pulley and 3 and 2.5 for alt pulley just to illustrate the point.
from link above, notice the turn on alt speed. Also the amperages listed are what the alt CAN do not what it always does in terms of output.
