My alternator light was on and alternator and battery checked out ok. then coolant was leaking and had new water pump put in on Tuesday. Now on thursday alternator light back on! help!

 

Cathy, I would take a look at your battery cables. Odds are, you have a cable that is starting to go and that is causing the voltages to fluctuate and making the computer think something is wrong. If you want me to go into more detail,I will go into as much detail as you can stand.