Car quit, took it to a mechanic who installed new alternator and battery. Alternator charges to over 17 volts, headlights quit working and it seems that the radiator cooling fans don't work either. It will start if we disconnect the battery overnight. I unhooked the battery scratched the lead back across and didn't seem to have a very large spark (under hood light and interior lights came on, interior went off shortly after). Help!!!
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Re: battery is dead if it isn't started every hour.
The Alt is frying your new battery. 17v is too high Max charging voltage should not be above 14.2v on the high and 13.6v minimum low. Regulator on alt is running wide open and not charging any ampereage. If not corrected, bye- bye battery. Good luck.
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Wouldn't be a fuse, but it seems as if the alternator is still not putting out normal power, or else your battery has a problem taking a charge. Better have the battery tested for a dead cell. also see what a voltmeter says about alternator output now. If you have an electrical problem in the wiring somewhere or in the alt. charging controls, then possibly one or more of the diodes in the alternator may got burnt out. That means the alternator puts out less power.
On some newer cars, the engine computer, pcm, controls the rate of charge of the alternator. So you have to be careful diagnosing -know how your system operates. That's why mechanics always ask for year, make, model, and engine size if applicable.
you mentioned new alternator and battery, but it seem that the alternator is not charging, when you install the new battery the car started and run and after hours of running specially if head light is on the car shuts down. this is an indication that the alternator is not charging. (factory defect) have it checked or return part to auto supply.
if alternator is good and you have the car jumped and run it will not shut down even if your battery is dead because the charge of the alternator is enough to power the electrical system of the car until you turn it off. this applies to all cars
You have a bad alternator. Get the alternator checked, the alternators in 98 cavalier require at least 13 to even start the car off of battery power. The alternator is what charges your car's battery while you are driving. if you have bad alt then your jumping the car is pointless cause it won't harge your battery at all it just kick starts the engine with power from the other vechile. If the alternator is showing at the very least more than 15 when its tested time for a new one. They should run about $90-110, it's an easy do it yourself installation to. Good Luck!!!
it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.
Your alternator died. You drove until your battery died also. You need a new alternator and a new battery. You might be able to get away with just charging your battery. Do Not jump start the vehicle and let the new alternator try to charge the old battery! Take the battery to a service station for testing and a charge. Install the new alternator and then install the charged battery not vice versa and you'll be fine.
Interesting problem.There are a number of things that can contribute to these symptoms:Battery not holding charge, charging system not working, bad/corroded battery and/or starter cable connections, and of course something draining the battery when the ignition is off.
Before doing these tests, make sure the battery is fully charged by disconnecting it from the car and charging it 24 hours with an external battery charger.
Is the charging system (alternator) working?Accords have an idiot light, not an ammeter/voltmeter, so it could be your car isn’t charging and the indicator light is burned out.Connect a voltmeter to a fully charged battery and observe the voltage (should be about 13.8 volts).Now start the car and observe the voltage again, should be higher than before (around 15 volts).If the voltage doesn’t increase at least slightly either the alternator belt is loose and slipping or the alternator is bad.
Are the battery terminals tight/clean?Any corrosion on the terminals or wires?How about the end that connects to the starter?How about the ground wire to chassis?Any corrosion could produce an intermittent connection problem that acts like a dead battery.
The battery may be new…but is it good?Charge it, connect it and confirm the car starts.Then DISCONNECT the battery, let sit 24 hours, re-connect and try to start.If the battery now acts dead maybe it is bad.Exchange under warranty.
And last, something is discharging the battery.First question, do you have any non-Honda add-ons like an aftermarket audio system with a power amp?Audio power amps have a direct wire to the battery for greater power, if the amp isn’t turning off then you’ll have a drain.Try disconnecting such equipment and see if your problem goes away.If that’s not it connect an ammeter in series with the battery with the ignition OFF and start pulling fuses one by one until you find what’s causing the drain.