[3rd Gen : 96-00]: Alternator or PCM
#1
Alternator or PCM
Ok, My 2000 Caravan 2.4l, 486,000 miles lit up the battery light yesterday still drove over 200 miles without running battery dead, I have a bluetooth reader that works with my tablet. Monitoring voltage it sits at about 11.1 but every 5-10 mins jumps up to 13.5-14.2 The auto parts store put the tester on the battery and said the battery is good the alternator is bad. I have seen many threads that suggest that it can be eitbher the alternator or the PCM due to the voltage regulation done in the PCM. Is there a way to determine which is bad the alternator or the PCM.
I also started getting a misfire which if I understand correctly could be the PCM or just the low voltage.
Thanks for any input.
Bob
I also started getting a misfire which if I understand correctly could be the PCM or just the low voltage.
Thanks for any input.
Bob
#2
#6
On the rear of the alternator is a 2 pin plug, dark green wire and dark green with orange tracer. Running you should have 12 volts to the dark green with orange tracer. That is the feed for the brushes. The dark green wire is the wire the PCM grounds to get the alternator to charge. If you were to back probe that wire and ground it, the system should full field. If the system is running at 11 volts and you ground that wire and have 11 volts still and have battery voltage to the other side of the alternator, the alternator is bad.
#7