Question about 2003 Ford Mustang

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Radio not working after alternator replacement

I had hooked up the positive to negative, trying to test another battery after my car had died. It fried my alternator. After replacing the battery and alternator, my radio and clock on the radio do not come on. I checked all the fuses, none were blown...what else could be the problem

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  • 396 Answers

Apparently you cooked it along with the alternator.

Posted on Feb 06, 2010

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Ford focus 1.8tdci 2004 appears to have not enough battery tp start. I have tried to jump, charge and changed the alternator. Help please I need the car urgently


The fastest way to jump it is using another car. Connect the positive and negative on the running car, then positive to Positive, negative to negatice on the dead cars battery. Then try to start it. It should start right away. Remove the jumper cables right after it starts. Now if the batery doesnt hold a charge after running it for over 30 minutes then when you havr time, takr the battery out and test it at a auto parts shop. Its normally free to test it. If you get a new battery and after a week it dies again then its probably the alternator.

Jun 24, 2014 | Cars & Trucks

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How to know if altanater is bad


You can do a very simple test to see if the alternator is working or not. All you do is start the car, while the car is running, remove the negative battery cable. If the car continues to run, the alternator is still working. If the car dies, the alternator is not working anymore. Another thing you can do is take a volt meter to the positive and negative posts of the battery. While it's running put the voltmeter probes on the pos. and neg. posts of the battery and the voltage should read 14.5 volts at idle. If it's around 12.0v, then the alternator isn't putting out power anymore to charge thet battery.

Mar 22, 2013 | 1989 Dodge Ramcharger

1 Answer

Battery drains while sitting


Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

Jul 06, 2012 | Cars & Trucks

1 Answer

Alternator over charging


The alternator is vital part of your car or truck's electrical system. When the vehicle is running, the alternator provides a constant charge to the battery, as well as to other accessories. Without the alternator, the battery will eventually discharge. However, if the alternator isn't working correctly, it may send too great of a charge to the battery, which is known as overcharging. This condition is dangerous to your car's battery and electrical system. You can test to see if the alternator is overcharging, using a simple voltmeter. Start your vehicle and open the hood. Be aware of the moving parts within the engine compartment, as you do not want to get your hands or tools anywhere near them.

  • 2 Locate the vehicle's battery. It may be obscured by protective shields, the air filtration or intake system or a fuse box. Whatever the case, you need to remove everything that covers the battery. You must have access to both the negative and positive terminals of the battery.
  • 3 Turn the digital voltmeter on and adjust it to the proper settings, if necessary. The voltmeter must be set to "DC" and 12 volts.
  • 4 Connect the clamps or leads of the voltmeter to the battery. You must connect positive to positive and negative to negative. The positive lead is usually red or yellow, while the positive terminal on the battery will be marked with a plus sign. The negative lead on your voltmeter is black, while the negative battery terminal is marked with a minus sign.
  • 5 Examine the voltmeter. If you've hooked it up properly, you should see a reading somewhere between 13.6 volts and 14.3 volts. A reading higher than 14.4 volts warrants further testing by a professional. If your alternator is found to be overcharging, you will need to have it replaced.
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    My battery had die a couple of times and i change it once already for a new one and still does it how can i check if it is the alternator


    There are to ways you can see if your alternator is working properly. The first way is to take your vehicle into your local mechanic and have him perform a load test on your charging system. Most of the time a mechanic will do this for little or no cost because it is easy to do and only takes a minute or so. The second way you could check to see if your alternator is working properly is to disconnect your battery from your car while the car is running. If your alternator is good the car will continue to run until you turn it off. I hope this answers your question.

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    I have a 2003 ford focus zx3 my battery light comes on then the car dies, you can turn the car off and take out key and the radio will not only stay on but you can turn it on and off. I have replaced the...


    In order for the alternater to charge there has to be some current in the battery; it may needan external charge boost to do the testing. Since replacements have already been made there must be an internal current drain on the battery Since the radio will not shut off this would be the most likely component to start checking. Suggest you locate and remove the appropriate fuse and see if the battery discharges after it has beencharged -up If this solves the problem then obviously the radio needs to be replaced. A test light inserted between the negative post of the battery and the negative battery cable will indicate battery drain but some is normal due to to computer keep-a- live and security systems.

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    I have a gmc 1998 turbo diesel that cranks but wont turnover or try to..i have replaced the supply pump as well as the inline pump..what can i do to get my truck started ..thank you ?


    TURN OFF RADIO FIRST TO KEEP FROM LOCKING IT OUT WHEN YOU DISCONNECT NEGATIVE BATTERY CABLE. SOUND LIKE WEAK BATTERY OR STARTER MAKE SURE BATTERY CABLES CLEAN AND TIGHT.IF BATTERY GOOD REPLACE BATTERY CABLES.CHECK STARTER MAKE SURE STARTER SOLENOID AND STARTER OKAY.YOU CAN HAVE THEM TESTED AT AUTO PARTS STORE OR USE A REMOTE SWITCH.REMOVE STARTER FROM VECHICLE USE JUMPER CABLES.HOOK NEGATIVE GROUND CABLE TO BATTERY NEGATIVE THEN GROUND STARTER BODY WITH NEGATIVE BATTERY JUMPER CABLES HOOK POSITIVE JUMPER CABLE TO BATTERY POSITIVE AND STARTER POSITIVE TERMINAL.THEN HOOK REMOTE SWITCH TO STARTER STARTER SWITCH AND OTHER REMOTE WIRE TO STARTER POSITIVE TERMINAL.PRESS REMOTE STARTER WILL SPIN IF GOOD.MAKE SURE INJECTION PUMP STATIC AND DYNAMIC IS TIMING CORRECT BEFORE STARTING TRUCK.

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    sounds like chargeing problem test the chargeing system.Battery has 30 min resavore before it dies this usaly happens when altenator stops chargeing

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    Battery, Alternator Problem 02 Sonata?


    Very possibly damaged the alternator; these have six diodes that rectify the ac produced by the alternator (hence its name) and are oriented to produce a positive output/negative ground.  This means that they will conduct if their output has a relative negative voltage applied to the positive output terminal.
    If you haven't done it already, you need to disconnect the battery cable or the shorted diodes will drain it completely again and could even damage the plates from heat. 
    Generally, rebuilt alternators are quite reliable so replacing with new isn't really justifiable; the commutators and windings are not stressed hard so replacing brushes and diodes and a good (chemical) bath are about all they need to do to restore them. You may even have a local shop that will restore your own unit if you wish.    

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