mississippiedge Posted July 10, 2019 Report Share Posted July 10, 2019 ok, so I've read a few threads but really with no luck, had a check charging system come on intermittently when driving past 40mph, car was charging at 12.5 and down to 11.5 when revved to 2k replaced the alternator and now car is running rough (I assume ecm needs to relearn since car sat for a while disconnected) anywho after replacing alternator car still has check charging system light stays on 100% of the time Kind of at a loss of words and dont know what to check next. battery is abt 1.5 years old, had a bad battery on it before but never caused poor charging issues. Ideas to check next before I dump 330 dollars on a new battery? (car audio battery) could I have had the luck of buying a bad alternator? Quote Link to comment Share on other sites More sharing options...
onyxbfly Posted July 10, 2019 Report Share Posted July 10, 2019 (edited) Something is definitely drawing and will eventually kill the battery. If you have a OBD reader you can check to see if you have any DTCs that are not portrayed as a check engine light. Another option would be go to go to autozone/ advanced auto or someplace similar and have them run a check on your charging system. At least at that rate you have some sort of idea of what your next steps should be. You didn't mention it but is your alternator new or rebuilt? Is it Ford or aftermarket? Some aftermarket parts fail to perform as expected compared to official ford parts. Not stating this is your problem but its something to consider. Double check your terminals etc, alarm connections etc just tossing ideas out there. I had what I thought was a good terminal kill a battery on a expedition once. If your battery is 1.5 years old it should still be under warranty. Good Luck! Edited July 10, 2019 by onyxbfly Quote Link to comment Share on other sites More sharing options...
mississippiedge Posted July 10, 2019 Author Report Share Posted July 10, 2019 battery doesnt drain when car is off and hooked it up to a scanner and no dtcs detected going to try and get battery and go from there cuz the alt is new Quote Link to comment Share on other sites More sharing options...
mississippiedge Posted July 10, 2019 Author Report Share Posted July 10, 2019 battery doesnt drain when car is off and hooked it up to a scanner and no dtcs detected going to try and get battery and go from there cuz the alt is new new alt is a Remy alt Quote Link to comment Share on other sites More sharing options...
Philliphalljr Posted January 1, 2023 Report Share Posted January 1, 2023 Curious, what was your outcome on this? Quote Link to comment Share on other sites More sharing options...
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