Went to start the truck last Saturday after it sat for a week. Truck cranked right up with no signs of a weak battery. Pulled out of driveway and battery light came on. Drove only about 2 miles with AC running on high. Parked, turned off truck. About a hour later went to start her back up and dead. Completely dead. Not even a clicking when turning key. So I jumped it and took it for a nice ride with AC, lights radio, etc all off.
Battery light still on, but appears to be charging, because since that episode it never died on me again.
What I have done since:
1. Check codes - It is indeed the P0625. I cleared the code and it came right back upon next start up. Have done this a few times.
2. Tested the batteries with a multimeter:
engine off = 11.45 volts
engine on and revving slightly with all electronics off ~ 12.50 - 13.50
3. Plugged in Gearbox Z Electron tuner to get some readings. While driving on highway it will read as high as 14.3 V with electronics off. With AC and lights on it will drop to about 12.3V.
I appear to be charging quite well. I have not had dead batteries since that one episode, but the battery light and code stay on.
I have read other posts and it appears this means a bad or dying alternator. But if that was the case wouldn't I not be charging at all?
Battery light still on, but appears to be charging, because since that episode it never died on me again.
What I have done since:
1. Check codes - It is indeed the P0625. I cleared the code and it came right back upon next start up. Have done this a few times.
2. Tested the batteries with a multimeter:
engine off = 11.45 volts
engine on and revving slightly with all electronics off ~ 12.50 - 13.50
3. Plugged in Gearbox Z Electron tuner to get some readings. While driving on highway it will read as high as 14.3 V with electronics off. With AC and lights on it will drop to about 12.3V.
I appear to be charging quite well. I have not had dead batteries since that one episode, but the battery light and code stay on.
I have read other posts and it appears this means a bad or dying alternator. But if that was the case wouldn't I not be charging at all?