Question about 1999 Hyundai Sonata

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Car runs on alternator power for only a brief time when battery disconnected after starting

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That doesn't mean anything, most Asian cars need the battery connected to run . It is how the alternator is wired.

Posted on Apr 16, 2014

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Posted on Jan 02, 2017

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Battery was dead, charged it, started jeep but will not keep running, is it the battery


It could be the battery, yes, but it could also be an alternator fault.

If the alternator is faulty -( usually when the rectifier pack on the back of the alternator burns out) - the battery can run to earth and become flat within seconds, or it feels like a misfire when driving.

I once had a car that needed the battery charging every time just in order to start it. Once running, there was a misfire. Then the battery was too flat to restart the car. It was an alternator fault.

Disconnect the plug/wiring from the rear of your alternator FIRST. Charge the battery. Leave the plug DISCONNECTED from the rear of the alternator. Start your vehicle.

If your vehicle starts and runs ok with the alternator wiring disconnected - the alternator is suspect. The usual culprits are the diodes in the rectifier pack (the bit on the rear of the alternator). Burnt out, they can cause a battery to become flat within - literally - seconds.

Leave the alternator disconnected and try starting the car several times. Switch on your headlamps and try and restart the vehicle a few times over a 15 minute period.

If it continually starts even when the headlamps are on, your battery probably is ok.

Even better ... take your vehicle to an auto electrician. It would probably take 2 minutes for them to dignose the problem. this saves you 'guessing' and buying replacement battery/parts that aren't at fault.

It doesn't sound as though you have a big problem .. just one of the many 'irritations' that we motorists suffer...

If the problem is the alternator there's no need to replace the whole unit - you can replace the rectifier pack on the rear. If it is the battery at fault (an auto electrician will tell you within seconds) .. well, that's life.

Jul 11, 2014 | 1999 Jeep Grand Cherokee

2 Answers

Lights went out and radiator fan stays running after car is shut off


It sounds like an alternator, yet you say the fan still worked after you disconnected the battery? And the car was still running? Or the car died out. Sorry, need some more details on this one.

Jan 08, 2014 | 1989 Plymouth Reliant

1 Answer

I have 2000 F-250 super duty with charging issues. Truck died on way to work. Put a new Ford alternator on it but still not charging. Took alternator to alternator shop to test. Tested good. Checked and...


Have the battery checked. There were a few years when Ford had an odd problem. The battery saver feature was designed to disconnect power draining equipment to leave you with enough juice to get the truck started. BUT it has been known to disconnect the charging system even at expressway speeds.

If the battery is weak enough to make the Alternator work too hard, the battery saver sees this as a power using problem and disconnects the charging circuit.

It is a sneaky problem and even using a battery charger the truck could be running and showing a charge, but disconnect the charger and it is a TIMED activation of the battery saver.. It activates after a few minutes and then your truck will discharge.

Another possibility is the plug-in for the small wires going to the alternator brushes. When you plug the plastic clip into the Alternator, the wires may not be sliding on the terminal. Often the wires ride up the plastic clip and fail to make contact with the terminal. In the store, they use their harness and clip and the terminal makes contact and works.

Oct 10, 2013 | Cars & Trucks

1 Answer

2001 ford focus se. Charging system inicator came on briefly 3 times. Car cut out 25 min later. Recently replaced battery and terminals. Seems like alternator but after dying car wouldnt start 10 hrs later...


(this damages the ecu Disconnected negative terminal and car still ran) check and clean the alternator connections. and check the earths. light can come on if water has gotten into the alternator or the connection has come loose. you don't disconnect the battery when the engine is running as it can shock the ecu alternators have a built in voltage stabilizer but this only works with feed back from the battery no feed back it can convert ac instead of dc and blow up the ecu. it also damage other parts.

Jul 25, 2017 | Cars & Trucks

1 Answer

2004 ford focus se replaced alternator couple of mnths ago went to start this morn battery dead charged battery still no start. jumped of another battery started but when removed jumper cables car died


Sounds to me that your battery has shorted out and will not take a charge.Disconnect the battery and try to charge it, then check to see if it has taken power with a volt meter. A shorted battery will take all the power from the alternator and run it to ground leaving no power to run the car. Also check the alternator output with a volt meter after you have checked the battery as a shorted battery can burn out the alternator.

Oct 08, 2010 | 2004 Ford Focus

3 Answers

I gave a friend a jumo yesterday and my car wont start. No power at all


Is your alternator and your battery the same volts if so then it's your PCM or ECM and do remember that they do need to be program

Jul 22, 2010 | 2005 Nissan Altima

2 Answers

Suddenly cut off after lossing electrical power on all inside lights and gauges. also has low charge. is it the alternator or battery? also the o2 wire is disconnect


there may be a short on the battery (most likely) yet you can get it checked for free at any local (national chain) auto parts store they will check both at no charge to you and offer replacements remanufactured alternators usually they have in stock.

May 21, 2010 | 1998 Saturn SL

2 Answers

My 96 lincoln started having problems with the interior lights staying on all the time, then the drivers side window did not work, then the power steering was operating intermittenly and then stopped...


it is a bad idea to disconnect the battery of a running car. If the alternator is working it can destroy virtually any electric component that is on. Alot of shops and some auto parts stores offer free charging/starting system tests.(they sell more baterries and alternators)

Jul 19, 2009 | 1996 Lincoln Continental

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