The Ford Barn - View Single Post

cas3 · 09-23-2020, 09:40 AM

alternators whine from the load on them. the more it is charging (load) the more it whines. normally, just after you start it, it has a heavy load to recharge the battery from using the starter. if the system is all good it should quiet down after the battery is back up to full charge. it will always make some noise, but not what it does under full charge mode. if its always loud, you may have a weak battery which make the alternator think its job is never done. could be regulator bad too. got any accessory's running all the time?

09-23-2020, 09:40 AM	#4
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,573	Re: 38 ford alternator alternators whine from the load on them. the more it is charging (load) the more it whines. normally, just after you start it, it has a heavy load to recharge the battery from using the starter. if the system is all good it should quiet down after the battery is back up to full charge. it will always make some noise, but not what it does under full charge mode. if its always loud, you may have a weak battery which make the alternator think its job is never done. could be regulator bad too. got any accessory's running all the time?