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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: dbc28092 on January 10, 2015, 09:00:56 pm

Title: Alternator Belt
Post by: dbc28092 on January 10, 2015, 09:00:56 pm

I recently replaced the alternator on my 1984 C30. I decided to go with a higher amp alternator than the original. The problem I'm having is that the belt now squeals when I first start the truck. The belt squeals while the alternator is at maximum capacity. Once the batteries are charged back up and the alternator backs down, the squealing stops. I have tried two new belts and have retightened the belt several times. (My truck has the v-belts.)

Any ideas for stopping the squealing or should I just switch out the alternator for one with lower amps? 

Title: Re: Alternator Belt
Post by: Dr_Snooz on January 10, 2015, 10:58:05 pm

Have you tried the squeal stop belt spray? I had some success with it on my failing AC compressor. It ended up causing the clutch to slip instead of the belt.

This was on a serpentine setup with a tensioner. No way to tighten that belt.

Title: Re: Alternator Belt
Post by: VileZambonie on January 10, 2015, 11:14:47 pm

Wrong belt. Not tight enough