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Pretty sure your alternator died.
Battery voltage with the car not running should be close to 12.5 volts on a fully charged battery. New batteries need to be charged before they are installed to keep a good alternator from melting down and dying.
With engine running the battery should read about 14.5 volts indicating your alternator is charging. At lower rpms battery voltage will still be above 12.5 volts with the engine running.
If you get it cranked and the battery does not read above 12.5 volts, you have a bad alternator.
a simple test is to disconnect the vacuum hose to the brake booster and blank it off on the manifold side
if there is no problem, reconnect it and put your foot on the brake
if the problem is there --replace the brake booster
check all vacuum hoses including the vent controls and transmission actuator
if you haven't done it yet then run the fault codes for reports and that will tel you what should have been done first
The alternator is not working. When running, a voltmeter on the battery should be at least 13.5 volts, showing the alternator is working and the battery is being recharged. You have a charging system malfunction. check the connections between the battery and alternator. Check battery ground, engine grounds, and engine to body strap ground.
First, you can't and shouldn't test an alternator by disconnecting the battery cable while the engine is running. You run the risk of cooking the alternator and the computer. Thats how we used to test generators back in the last century. Is the check engine light on when the engine is running ? Is the battery charge warning light on ? There should be a fuseable link between the alternator and the battery that could keep the alternator from charging the battery. The ignition module would have no effect on the charging system.
There is a diode in the alternator that you fried the instant you disconnected the battery....go get a new alternator. This was an acceptable test on much older cars, but not these days......
did it stay running when connected to the car giving the boost? if so then the alternator is not charging the electrical system, get it serviced or replaced.
First: Are your Battery Cables (inside) and Battery Post nice and shiney? It is amazing how corroded/oxidized cables and post will kill a battery. Get then bright and shiney.
To test the Alternator. Start the Vehicle. You can Jump it if you have to. With the Engine running, disconnect the Negative Cable from the Battery. If the Engine dies, it is a bad alternator.
Was the "new" Alternator new or remanufactured?
Was it the correct alternator inespecially 'amps' for your particular vehicle?
Take the "new" alternator off and have it tested at auto parts store where you bought it.
Any remanufactured alternator may pass the factory inspection but will fail at the auto parts store. Just because it came out of a new box, and looks new, doesn't mean it works new.
Always when buying and part with a "motor" attached to it from an autoparts store, insist that the new one gets bench tested.
If this does not fix the problem:
Are your belts slipping? Worm out, loose or slipping belts will not turn the alternator pulley correctly and draw the battery dead.
Inspect the Red Positive Wire coming off the Alternator back to the battery. Look for any burnt, melted, or shorted areas.
The Battery Starts the vehicle. The Alternator runs the engine and trickle charges the battery.
Let me know if this helped, or if you have addtional information or questions. Feel free to contact me at FixYa.com!
keep in mind, your engine use both source of power to run, one from the battery and one form alternator. If the alternator is good, your engine should stay running regardless if the battery is good or bad, the alternator should keep the engine running. It sound like to me the alternator is faulty not charging your battery or keeping your engine running, even though the alternator is brand new does not mean is good. My guess I would take the alternator back and get another one. the reason why your car ran for 25 min and die it has no source of power to keep the sparks going although the alternator should keep the engine running and at the same time charging the battery but is not.
I would check the alternator again, it apparently isn't charging the battery with engine running. You need a volt meter or amp meter to test this. Also does the battery discharge when the car is not running?
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