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ALternator squeel

Warren Lovell

Member
476
4
18
Location
SAN DIEGO, CA
Anyone tell me why the alternator squeels and then goes away after a few minutes of running?

It also will stop squeeling if I turn off the fan motor, so it is definetely load related....is some part failing in my alternator?

thanks guys,

Warren
 

davemccoull

Member
93
2
8
Location
Nelson Lancs U.K.
Alternator squeal

I had similar fault with my Prestolite. When running the belts would start sqealing intermittantly And also on start up. The belts where tight and batteries fully charged, but the battery charge indicator was in the red.
When i checked aternator output it was 36 volts (way too high should be28 volts) tried adjusting on alternator, nothing. Turned out regulator in end of alternator was goosed. Swapped for good one, no trouble since.
Suggest you check belts and then output from alternator.
 

mangus580

New member
6,010
282
0
Location
Western NY
Silly question Warren.... are you 'sure' its the alternator? and not the fan motor? GM Fan motors are known to squeal some......

If it is a belt for sure, it sounds like you have a loose one. When you have a heavy load on the alternator, it turns harder, and promotes slipping alot easier. Maybe just replace the belt while you are at it.
 

kenny

Member
186
2
18
Location
San Antonio Texas
Both of mine squeal after start up for a couple of seconds but only if I push on the peddle.
I just let it idle for 2 minutes before I leave and no Sgueels.
I am just to lazy to spend the 2 minutes each to tighten them because it does not do it if I let it idle for a minute or 2 before take off.
 
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