got another alt you could sub for a quick test to try & pin it down. agreed, I'd sure think a noise from either one of them would be RPM dependent, especially the pump. EDIT first unplug a field wire on the alt & see if it gets quiet

Last edited by RapidRobert; 08/21/16 08:33 PM.
live every 24 hour block of time like it's your last day on earth