Car running of battery, altenator working 30%. NEW Altenator and battery, still not working right...Auto Zoner said maybe Wire to altenator was bad. Trying to change myself.. can follow wire frm altenator, top left of motor down to front then around bottom and up on right side but dont see were it connects on other end..A picture or good instructions would help..
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Re: Altenator Not working Well
Were talking about the big fat wire right? runs to the starter where the positive battery cable connects. Be sure the connections are clean and shiny bright on that cable and the battery connections and the starter connections. Make sure where the alternator bolts to the engine theres no corrosion and the bolts themselves are clean too, thats the ground for the alternator. Check the ground cable on the battery where it bolts to the body and or the engine too.
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as its a used part it may not be in working order , check the charge rate by putting volt meter across the battery terminals when engine running , the reading should be around 13.5 -14 volts , if not then check the alternator belt is tight enough and retest the charge if lower than 12 volts then the alternator is useless , a non charging alternator will give the symptoms you've described, th ered icon is the non charging warning light , dont drive if the check is low as will ruin your battery as well, take alternator off and get a lift back to the supplier , best to by new
ALtenator runs your car while it is running and charges your battery. If your altenator is bad you car will run on the battery until it drains the battery dead. So no the altenator will not prevent you car from starting. Check your fuses.
in order for the car to do conventional jump, you'll need to leave the booster cables hooked up for say, 10 minutes at least. you may have left lights on accidently.while the other car is attempting to boost yours,look for anything you may have left on,headlights,an interior light on,maybe a door left cracked open.the cold weather wreaks havoc on car batteries. your battery may need replaced. autozone, advance auto parts, both of these parts places replace car and truck batteries free.they also can check your battery to see if does need replacement.they can also tell you whether you may have an altenator thats bad, your car dieing issue may be your altenator bad,when your altenator goes bad,the car will run until the battery is drained completely. if that is the case,you can take your battery out, have it charged,then drive to a close repair shop for altenator replacement.hope this helps,and as always,thank you for choosing fixya.com
Your issue is indicating two problems. First let's talk about how your charge system works so that you can see what happened. The battery is there to start the engine. At the point the engine starts, the alternator takes over and provides power to the engine and also charges the battery for the next time you start your car. If the alternator fails to work, the engine runs solely off the battery. The car should have indicated that the charge system is not working, maybe you saw a battery light on your dashboard. After some time, the battery is depleted and will not start the car or be able to run the engine. So it appears that you have a defective alternator, and also your battery is either discharged, or is also bad. When you hook up your car to jumper cables, you are running off of your buddy's charge system/battery, so when you disconnect them, your car dies.
I gather the old battery was replaced because it was dead or dying.
Was the battery light on for that one too?
Is the belt around the altenator good?
Cables good? No breaks or frays? Connectors clean and tight?
If you have a multimeter and are comfortable working under the hood with the engine running, you can check the altenator. Black wire to ground (any bare metal surface or the negative battery terminal) There is a single wire on the rear of the altenator. Red to this one.
An alternative: Most auto parts stores have the facilities to do a bench check on your altenator. I recommend auto parts stores over a shop because their ulterior motives are trying to sell parts not service. They are less likely to 'Discover a Problem' that previously had no symptoms.
Also keep in mind, just because a battery is new, doesn't mean it's necessarily good. They can sit on the shelf for months, be dropped, whatever. The auto parts store can also perform a 'Load Check'. Voltage is one thing. A load check simulates the draw of a starter. No black magic, it's either Pass or Fail. Fail means replacement.