Question about 1996 Ford Mustang

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Altenator on my car will not charge, already charge alt,also car starter stays on when starting vehicle, what could be wrong

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  • Anonymous Mar 22, 2009

    alternator will not charge battery



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Check all connections including the lower ground from the motor where it connects to the k member. as for the starter not shutting off check your ignition it might be faulty heavy sets of keys over the years cause problems for them.

Posted on Apr 08, 2009


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Starting and Charging

All starting systems are basically the same in operation for manufacturers. The starter takes power from the battery to crank the engine. Generally the large wire on the starter is from the battery and the small wire is from the ignition switch. The large wire will have battery voltage on it all the time, the small wire will only have voltage when the ignition key is turned into the start position.

The altenator on all vehicles is designed to provide power for all car electronics while the engine is running, there is a large wire (usually red) that comes from the battery, and two to three small ones that come from other circuts to regulate how much power comes out on the large red wire.

The only relationship between the altenator and starter, is the battery, it is important to remember that the starter takes power in the form of amperage from the battery, while the altenator send power in the form of amperage to the battery. Thus an altenator can never be the cause of a vehicle that will not start. These two systems only share the battery and other than that they are not connected.

on Mar 27, 2009 | 1999 Ford Escort

3 Answers

No charging condition - tested new alt, tested new batt

OK....Since you've tested ALT & BATTERY?..Then you should inspect that missing fuse for horn and see if maybe it's been put in as a replacement in a port for anything to do with charging system,ie: alt,battery or other?....Then check ANY fuse links on the wiring/battery cables and other like to altenator etc....If you dont know what a fuse link is,most times it's on the hot wire that goes to starters,close to it,and to explain what it is--it's a short length of wire that is smaller,like a filament,like a bus fuse,cept these are coated and you cant se theyre blown,you have to do a continuity test to see if filament type wire isnt broken.....Another thing you may want to try is ADD an additional body ground wire from battery negative post to body of vehicle.I had a 71 Monte Cralo way back and I went through a similar thing and NO electronics thank god! But I added a fresh,thick wire from battery to body heavy bolt type screw and problem was solved....Hope I ahave helped,please post if it did...Thanks JD

May 02, 2017 | Cars & Trucks

1 Answer

2001 mercury cougar

It sounds like the Altenator. If the bench test was done properly and it ism good then some thing is wrong between the Alt. and the battery. A simple test is to start the car and disconnect the Neg. battery cable if the car keeps running your charging system is good.This probably means you have a draw on your battery with the car off. If it dies power is not getting from the Alt. to the electrical system check all the wires. I have had charging systems checked before and knew that they were not doing it right and had to ask for someone else to do the test over. If you don,t know about these things your self then maybe a trip to the dealer. You will pay more but you know the test will be done right. Good luck.

May 26, 2012 | Cars & Trucks

2 Answers

Engine will not crank over when vehicle sets for extended period of time (5-6 hours), but will start when jumpers are hooked directly to starter? *already installed 694 cranking amp battery and grounded...

If battery is new, and altenator test good which would mean your battery is getting charged, then check the igntion wire that goes to the solenoid. They can get loose, broken, or dirty connections.
Check your battery cable connections on battery and on starter and ground to make sure they are very clean as well as tight.

Nov 10, 2010 | 1995 Land Rover Range Rover

1 Answer

Bat good, alt good, starter good. will start when jumped and will stay running but when shut off it wont start again untill you njunp it off again.

Altenator good? Did you bother to check the diode in the altenator? If its blown it will not let the voltage regulator charge the battery. The only way to check this on the engine is to have it running. Take a volt meter and check the voltage while running. If 13.5 volts shows it may seem to be charging the battery right? Maybe not. That the probes from the volt meter and invert the probes from red to the negative battery terminal and the black probe and connect it to the positive terminal. While running if the same voltage shows the diode is bad. The diode prevents the current running in reverse. If running both ways no charge is getting to the battery

Apr 20, 2010 | 1994 Mercury Sable

1 Answer

2004 jeep liberty 3.7 eng will not crank over jump start it will start battery only year old

Sounds like your altenator is bad. Most part stores will test for free, in or out of vehicle. Battery, Alt, and starter can be checked for free.

Oct 16, 2009 | 2004 Jeep Liberty

1 Answer

Something is draining car battery

I would check the altenator, wiring, starter draw.
when you try to start the car. Turn your lights on first then start the car. The lights should get brighter with the car running. The altenator should be charging okay. Check your battery ternimals for corrosion , clean them off. The age of the battery may not be able to hold a charge. I would have the vehicle checked at the local repair shop.

Jan 26, 2009 | Chevrolet Prizm Cars & Trucks

1 Answer

Altenator problems

On an American designed charging system the truck should remain running, on Japanese cars it will die, but to anser your question yes you almost surely have a defective alternator. Make sure the battery is fully charged before the new Alt. is installed, if you don't the new Alt can be overheated and damaged.

Nov 08, 2008 | 2001 Dodge Ram 2500 Truck

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