I have a 2003 Ford F150. My truck's battery was draining whenever I drove it. I had the alternator and batter tested. The alternator failed so I replaced it with a new one. However the problem did not got away. The battery light is still on and the battery will still drain when my truck is on. All of the connections between the alternator and battery are good. What could the problem be?
If the battery light is on while its running I would recommend unplugging the push on connector and see if the light now goes out. If so the new alternator may be bad. The wire that controls the light is grounded by the alternator if a problem with the voltage regulator is detected. If you unplug it and light stays on you have a short in the circuit. I don't have a diagram in front of me to give wire colors but its a start
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