Why wouldn't it stall? You just remove power from the PCM!offroad4x4 said:Ok just got home from advance auto and they said the alternator dead. They also said the best way to check is to disconnect the positive battery cable. If it stalls the the alternator is not charging. Is this true? He did it to mine and it stalled
You check the battery voltage at rest and it should be between 12-13V range. Start the engine and the voltage should rise to somewhere betwen 13.5V-14.8V which means the alternator is "trying" to charge. Put you high beam head lights, heater, etc. for a load and the voltage should drop and then rise back to the 13.5V-14.8V range. Over 15.2-15.5V is considered to be overcharging. If the voltage drops below 10V while starting the battery is undercharged.SUVord said:Disconnecting any of the battery terminals on these cars while the engine is running is the dampest thing I've heard.And that because there is a great possibility that you burn the alternator's voltage regulator plus running the danger of putting the PCM to sleep for good.
Any place that practice that method, (which goes back 40 years), should be avoided, no matter what they are called or how many years are in the business.
With time and specific usages one or more battery cells get warped.That means that the battery can not give full voltage neither accept full voltage.
So, here comes the "idiot", checks the battery's input with the car running, sees it low and decides that the alternator is the culprit, while the battery screams for a change.
That is the bad thing with franchising.
The Escape (and maybe other cars nowadays) is odd in that the computer has direct control over the alternator. My Tribute with a new Motorcraft alternator doesn't output all the time, only on demand as the computer determines. At idle, it will be running at 14.3 and then drop to 13.1 for a couple of minutes, then go back to 14.3. During the time the alternator is turned off by the PCM, the battery light is not enabled.4 Wheel Drive said:Is there a sensor for this that can go bad?