Just went thru this with my car. 11_12 volts at idle,,,, worse as I turned on the fan, water pump etc was killing my battery,,, etc. my alt was bad,,, I had a one wire, but upgraded to a three wire to get the sensing function. 60 amp denso alt from mancini with the bracket kit,,, it is actually a toyota fore runner alt,,, that is being used for mopar race applications,, it fixed my problems,, now I have a steady 14 volts and the volt meter doesn't even flicker when I turn on the fan, water,etc. I can post the part number if you need it.