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International Automotive Technicians Network
Re: Buzzing Noise and Missing something
Posted to HD/Fleet Forum on 5/6/2019

I initially thought that the IPR buzzing could be a backfeed but, from the diagrams and Google-ing, I see the IPR is a pulse width operated device. It is powered on the IGN ckt. So I'm thinking it's likely normal for the IPR to buzz when it has low voltage. Es... Login to read more.