Ok here is my problem since i bought the car alternator makes whining noise all the time(i thought ok i can live with that) at night my lights dim when i press brakes or turn on something (but it seems like just on sec.) also when i rev up engine lights getting brighter (more then 1000rpm). Today finaly got time and went to buy a amp.tester. Before doing any tests i cleaned up both terminals +- then after i messed up my hands i finally reached ground terminal on engine block and sand it also.
So here what I got

Not started engine --- 11.70v
Started --- 12.50v
Rev up 2000rpm --- 13.60v
Heater/headlights/rear windiw heater/stereo/ (rev up)--- 12.60v max
Heater/headlights/rear windiw heater/stereo/ (700rpm)--- 11.30v

So...............new alt???
If it's alt can i buy 110amp???? (because in local parts store 110 a lot cheaper than 125 amp.)

 

I think Im going through the same issues. Hopefully someone can chime in on this.

 

Doesn't seem like anything wrong. Those are OK voltages for an older battery. Haven't measured mine but the fact that the volts goes up means it's charging. My lights brighten up with revs too

Any other symptoms? Dead battery one morning, starting slow?

Or is it just the whine bothering you?

 

Could be the voltage regulator in the alt. Im not an alt. expert but I would say if you don't have a large stereo system in your car a 110amp should do fine. I would go with the 125 myself but hay it's your car!

How old is your battery?? Cables all in good condition?? Start there and if nothing works replace the alt... At least you'll have new cables and battery if nothing else. It can't hurt. The whining is probaly the bearings going out in the alt.. First sign of future failure

Also make sure your belt is not too tight......... That tends to wear out the bearings really fast

 

At once my battarey was drained because i left lights inside car on.
Yesterday start was really rough cause starter was turning very slow(-27C morning)
I dont know what to think

 

sounds like your belt might need to be tighten, if its loose or too tight.

 

I'd say your alternator is bad. The battery in my max is nearly 4 years old and I still have a consistant charge of 13.6-14volts at idle. You aren't charging at 13.6 volts until 2,000 rpms...so IMO your alternator is toast. And 110 amp will be fine if you don't have a system in your car (I went with 125amp just because I could get one brand new with no core for under $200) and installed it myself

 

You indicated 11.7V with engine not running. A charged battery with less than 12 volts is on its last leg. A constant whine from an alternator with a properly tensioned belt is also not going to last much longer. Personally I'd replace both. Better to spend a little now and have some reliability than to be stranded miles from home.

 

Your alternator is definitely going bad. Happened to my Max soon after I bought it. 4th gen alternators aren't the strongest things. It's probably a seized bearing. Replace the alternator NOW otherwise it will just die on you one day and then you're f$cked. I dealt with mine for a few months because I couldn't figure out where the whining was coming from. I thought it was the belts or my idler pulley, especially since the problem was worse when it was wet and rainy (still don't understand why!).

Repeat, replace the alternator NOW. If you don't, you're drastically shortening the life of your battery at the least due to the increased load, and at worst you're setting yourself up for an inconvenient breakdown. I think you'll probably pay around $400 for the part and labor at a Nissan dealer, but that's just from my recollection. You can get the OEM part cheapest at www.worldpartsexpress.com and then have your dealer install it or install it yourself to save a lot of money. My understanding is it's not terribly difficult but you have to remove the belts and stuff.

A parts-store alternator will probably work fine, but I'd go with OEM unless it's way more expensive. 110 amp is standard I believe, only a few Maximas with whatever "package" came with the 125 amp alternator. But 125 wouldn't hurt.

 

How to untight the belt chould i just screw counter clockwise the top bolt or i have to untight pulley first???

 

http://cgi.ebay.com/ebaymotors/Hayne...42777135QQrdZ1

Get a Haynes manual, it's very worth the price.

 

No shipment to Canada but thanks.
I read stickies and motorvate.ca
That guy says that he unscrew the tensioner first and then pulley but when he ended up with replacement he screw the tensioner and then tighten the pulley

 

+1 10char

 

I still dont uderstand why to loose the pulley if i just can lose the adjustable nut on top or i should???(and why)

 

Just turn the screw on the idler pulley counter clockwise, don't worry about the bottom one... It works for me everytime

 

You mean this one

 

Yep, that's the one, but you have to loosen the nut in the center of the pulley wheel a little before the wheel will move up and down to loosen or tighten the belt.

 

Thats exactly what i needed
Biiiiiiiiiiiiiig thanks

 

Wasn't there a problem with the alternator on a 97? You should check and see if yours is covered by the recall.

 

checked already on stealership
no recall on my baby(unfortunately)

 

OK mr.willis at first you have to post more than 25 replys to be able post your own threads
good luck

 

No more to say! You said it all!