Does anyone have a wiring diagram for the alternator on a 720B Volvo grader 2006? I have 3 wires connected to the alternator and I need to know where they go. My voltage has dropped to 19.3v-21.6 volts and I think the alternator is toast. The voltage drops if I rev the motor and if I remove the battery wire from the alternator (That 1 I know) I have no power coming from the alternator. Thanks