Question about 2008 Ford Taurus SEL
From personal experience alternators can test good when you take them off your vehicle and carry into a parts store. if when the car is running and you take the negative cable off the battery and it dies, than you know the alternator is bad. never remove the positive when running or before the ground post. had an 05 kia serento doing the same thing. replaced alternator and fixed the problem
Posted on Apr 20, 2014
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Posted on Jan 02, 2017
SOURCE: car wont start, acts like
Check the battery +12v power connection to the starter is in good order,
Check the ground connection between the battery negative and the engine/starter motor is robust and intact.
If no problem with above, replace the starter motor.
Posted on Oct 10, 2009
The diode inside the alternator is getting weak. The charging system is for a direct current as you may know (DC) when a diode gets weak or goes completely dead the charging system is conveted to an alternating current same as your house current works. When a vehicle charging system looses its DC current the battery will not charge through the alternator. To check and see if your alternator has a faulty diode do this with the ENGINE RUNNING. Take a volt meter with its setting on the DC MODE and touch the probes to the corect terminals of the battery. You should get a reading of voltage. Remember the reading as displayed. Now Remove the probes and switch the setting to AC mode then reverse the probes + to Negative & - to the Positive. If the readings display the same your diode is shot
Posted on Jul 11, 2010
SOURCE: 1991 ford ranger thought battery
before u decide the battery has an outside draw on it have the battery load tested, Kragen, Autozone and many other parts stores do this for free, when a battery is run dead like this it can develop a shorted out cell and this causes an internal draw, after u have verified the battery is good the next thing to do is go out at night and look for any lights that may be on in the interior, if u have lighted visor vanity mirrors make sure those are not on as well, also check consoles and glove box lights and cargo light for the bed.
Posted on Sep 22, 2010
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