Alternator Question
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Elder User
Joined: Feb 2002
Posts: 703
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From: Rochester
Alternator Question
Hey guys...first some info... 1986 Full Size Bronco, 302 EFI. Converted to a 3G (130amp) alternator a few years ago. Just last week the 3G went down hill...
I picked up a Junkyard 3G and replaced it last night. Power was good, 14.8 volts at the battery, had power to run all of my accessories, kept the battery charged etc.
My quesiton is this, whenever I get my electric fan kicking in "something starts squeeling like a banshee" and my voltage goes down to 12v according to my cab gauge. I can't tell if its the 3G bearings or the electric fan bearings or maybe the belts are too tight. If I give it a little gas...the squeel goes away for a little bit.
Any ideas?
I picked up a Junkyard 3G and replaced it last night. Power was good, 14.8 volts at the battery, had power to run all of my accessories, kept the battery charged etc.
My quesiton is this, whenever I get my electric fan kicking in "something starts squeeling like a banshee" and my voltage goes down to 12v according to my cab gauge. I can't tell if its the 3G bearings or the electric fan bearings or maybe the belts are too tight. If I give it a little gas...the squeel goes away for a little bit.
Any ideas?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
An alternator has the power of a motor running backwards. The more of a load you put on it the more it wants to turn backwards.
In short it is the belts slipping for the alternator, if the belts are to tight you can loose bearings. You may have to add a belt to the pulley system or put the old fan back on.
In short it is the belts slipping for the alternator, if the belts are to tight you can loose bearings. You may have to add a belt to the pulley system or put the old fan back on.
Thread Starter
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Elder User
Joined: Feb 2002
Posts: 703
Likes: 1
From: Rochester
An alternator has the power of a motor running backwards. The more of a load you put on it the more it wants to turn backwards.
In short it is the belts slipping for the alternator, if the belts are to tight you can loose bearings. You may have to add a belt to the pulley system or put the old fan back on.
In short it is the belts slipping for the alternator, if the belts are to tight you can loose bearings. You may have to add a belt to the pulley system or put the old fan back on.
Thanks Subford for confirming! Appreciate the speedy answer!
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