1997 Chevy Blazer Lights Dimming

CHEVROLET BLAZER
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DOVIER
  • MEMBER
  • 2 POSTS
I have 1997 chevy blazer , 4x4 ,4 doors .
the problem that is that head and all lights inside the car go up and down , sort of like they loosing
some kind of power. at first i Noticed my belt tenser jumping up and down and repaired that , but now my alternator is making a funny noise ;I took it off and went to auto zone to test tha alternator ; but they said it was good. SO my CAR lights keep going up and down like there is not enough juicy coming to them and like i said before , the alternator is making a funny noise like rororororro.
Any way I HOPE YOU GUYS UNDERSTAND WHAT I AM TALKING ABOUT.
THANKS DOVIER.
Dec 15, 2006 at 12:21 PM
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BOOTDOG
  • ✓Experienced Mechanic
  • 665 POSTS
let me say if the alternator is making noises, then replace it. the noise you describe is the bearing in the pulley going bad. now about the lights dimming, make sure that the battery connestions are tight and free from corrosion. if so then make sure the battery voltage is at 12 volts. if so you'll need to make sure the vehicle is charging properly. in order to keep a battery charged, it needs to be around 14 to 14.5 volts while running. take the vehicle to advance auto and they'll check your battery and charging system for free. good luck :)
Dec 16, 2006 at 7:45 AM
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Suggested Repair

Replace the noisy alternator, as the pulley bearing is likely failing. Also confirm battery connections are tight and corrosion-free, battery voltage is about 12 volts, and charging voltage is about 14 to 14.5 volts while running. Have the battery and charging system tested.

Conversation Summary

A 1997 Chevrolet Blazer has headlights and interior lights dimming and brightening. The owner already repaired a jumping belt tensioner; the alternator now makes a noise but tested good at a parts store. The expert says a noisy alternator should be replaced because the pulley bearing is failing, and recommends checking battery connections, resting battery voltage, and charging voltage, with a free charging-system test.

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