Bad alternator, makes whining noise?
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Bad alternator, makes whining noise?
I have this whining noise coming from the front of my truck. Im thinking its the alternator since its in that general vicinity. If i give it gas you can hear it in the truck aswell as outside. It sounds just like a psd turbo winding up if go wot. It gets really annoying when your trying to listen to music and it drowns it out while cruising.
Is there any way I can check to see if it's not working properly? When I give it gas to about 4000rpms while in park the lights dim a bit. Is this a tell tale sign that its going?
Is there any way I can check to see if it's not working properly? When I give it gas to about 4000rpms while in park the lights dim a bit. Is this a tell tale sign that its going?
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one way i know if it was the alternator if you can move the pulley up and down cause the only thing in the alternator that could make a noise like that is if the bearing on the shaft through it is out but i would see if i could move the pulley if it moves a lil than you know it is the bearing
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mine did that too!
ok. if you still need to know if it's the alternator just take off the belt and spin the alternator pulley. if it starts making that noise again (not as loud of course) it's the bearings going out of it. you can trade in the old one for a rebuilt one for about $150. hope this helps.
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For the 97/98, -Could be the MEGA Fuse 175amp or the inline mini fuse 15amp. The alts will have a high pitched whine when either fuse goes. BUT, you will get battery light illumination in either case.
Easiest way to check is to fire it up and poke a meter around. If everything is fine there. Remove the belt and fire it up. If you don't hear it, - it's a pulley, - most likely the idler. Could be the tensioner or the alts pulley as well.
NOTE: When you change the belt, - it's recommended to change the complete tensioner at the same time. Personally, I change both tensioner and idler pulley when servicing the belt in these vehicles. Although the idler pulley isn't recommended, - they fail just as much.