Battery Idiot Light On
(2013 F53) First trip of the season and the battery light is on, checked the voltage of the chassis battery and did a load test and it checked fine with 12.5 volts (Not running)and 13.5 volt running. ...
Forum Discussion
jeffo wrote:
Does anyone know where the sensor would be located?
There is no "battery sensor" on any Ford vehicle that I have ever seen. Yes, both the PCM and the alternators internal voltage regulator both look at battery voltage. The voltage regulator use the "A" terminal on the alternator, while the PCM just uses its normal 12+ input pin.
The PCM "commands" the alternator to output a certain voltage. The Alternator responds with "yes, I am" or "error".
If error is reported, the PCM sends a message to the dash to turn on the battery light.
