Recently the check battery light has been coming on at different times
throughout the day. In the morning at startup, on the freeway, or idling at
a stop light. I checked the original Ford battery, and the glass "eye" was
red. This led me to believe the battery was bad. I replaced it with a yellow
top Optima, but the check battery light still lights up. I took the car to
Advanced Auto parts, Auto Zone, and Pep Boys to see if they could find the
cause. Their machine couldn't find anything wrong. At idle the alternator
was putting out 13.2-13.5 volts, and 20 amps. I have Steeda underdrive
pulleys, but the techs said this was still an acceptable output for the
alternator being underdriven. I have
checked the cables, grounds, and alternator connections. I haven't had any
problems before, up till now.
I have had the underdrive pulleys for about 2 yrs now. All connections
are clean and tight. I don't know what else to check. Anyone ever have this
help is appreciated.