In response to an e-mail, the field voltage under normal loaded conditions (with everything working correctly) varies between 8 and 11 volts to the field terminal, prior experience has shown when the field voltage rises to the 22v.+ region the alternator is on it's last legs and needs to be...
I need help designing a circuit that will monitor the field voltage of a 24 v. alternator so it will set an alarm thru a plc system when a predetermined voltage is seen. This is for a PM program to help determine when the alternator is getting to a stage in its life when it should be replaced...