The Ford Barn

mike42 · 05-15-2018, 07:55 AM

I've got a '57 F-100 with 5.0 L 302 in it. It's making a screeching noise and the voltage regulator only shows charging at +10.....need a new one or rebuild ?

Thx....Mike

Ole Don · 05-16-2018, 09:13 AM

Remove the belt and spin things, the noisy one will show up. If it is the alternator, take it apart and replace the bearing. Many Ford and Delco alternators from the 70's to the 90's take the same front bearing, as do many idlers on newer vehicles.

mike42 · 05-16-2018, 03:49 PM

Thx Don will do.

Mike

scicala · 05-16-2018, 04:41 PM

If it's not the bearing, I used to rebuild alternators/generators a long time ago, and I remember that a bad diode in the alternator can make a strange electrical noise.

Sal

mike42 · 05-17-2018, 05:34 AM

Scicala.....would that also cause the gauge to show less of an amount of charge too ? It's around +10 now and not in the green area.

Thx....Mike

scicala · 05-17-2018, 09:03 AM

Sponsored Links (Register now to hide all advertisements)

Mike, yes the bad diode also caused a reduced charging rate if any, if I remember correctly.

Sal

mike42 · 05-17-2018, 10:03 AM

Thx much....I'll have it checked out

40cpe · 05-17-2018, 10:27 AM

I had an alternator on the family car that had a high pitched squeal after starting the car, I assume when the charge rate was high. Eventually the alternator went out and the new one didn't squeal.

mike42 · 05-18-2018, 10:48 AM

Thx Cpe......I might have the same prob....

Mike

05-15-2018, 07:55 AM	#1
mike42 Senior Member Join Date: Jun 2012 Location: Gaylord, Michigan Posts: 1,599	Alternator I've got a '57 F-100 with 5.0 L 302 in it. It's making a screeching noise and the voltage regulator only shows charging at +10.....need a new one or rebuild ? Thx....Mike

05-16-2018, 09:13 AM	#2
Ole Don Senior Member Join Date: May 2010 Location: St. Michael, Minnesota Posts: 1,713	Re: Alternator Remove the belt and spin things, the noisy one will show up. If it is the alternator, take it apart and replace the bearing. Many Ford and Delco alternators from the 70's to the 90's take the same front bearing, as do many idlers on newer vehicles.

05-16-2018, 03:49 PM	#3
mike42 Senior Member Join Date: Jun 2012 Location: Gaylord, Michigan Posts: 1,599	Re: Alternator Thx Don will do. Mike

05-16-2018, 04:41 PM	#4
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,698	Re: Alternator If it's not the bearing, I used to rebuild alternators/generators a long time ago, and I remember that a bad diode in the alternator can make a strange electrical noise. Sal

05-17-2018, 05:34 AM	#5
mike42 Senior Member Join Date: Jun 2012 Location: Gaylord, Michigan Posts: 1,599	Re: Alternator Scicala.....would that also cause the gauge to show less of an amount of charge too ? It's around +10 now and not in the green area. Thx....Mike

05-17-2018, 09:03 AM	#6
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,698	Re: Alternator Sponsored Links (Register now to hide all advertisements) Mike, yes the bad diode also caused a reduced charging rate if any, if I remember correctly. Sal

05-17-2018, 10:03 AM	#7
mike42 Senior Member Join Date: Jun 2012 Location: Gaylord, Michigan Posts: 1,599	Re: Alternator Thx much....I'll have it checked out

05-17-2018, 10:27 AM	#8
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	Re: Alternator I had an alternator on the family car that had a high pitched squeal after starting the car, I assume when the charge rate was high. Eventually the alternator went out and the new one didn't squeal.

05-18-2018, 10:48 AM	#9
mike42 Senior Member Join Date: Jun 2012 Location: Gaylord, Michigan Posts: 1,599	Re: Alternator Thx Cpe......I might have the same prob.... Mike