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Symptoms indicates a charging problem and possible causes are :
1. Faulty alternator. It could be failing intermittently and testing might not be conclusive. Get a vlotmeter and with engine running, test the charging rate between battery terminals. It should be between 13.5 to 14.5 volts without load.
Turn on AC and headlights, It should not drop below 13 volts.
Remember to run the engine for a few minutes before performing testings.
2. Slipping belting. Check belt tension and crank pulley harmonic balancer. If the hamonic balancer is bad, it could be slipping on the crank pulley and this would reduce the alternator rpm and cause charging deficiency.
3. Bad connection between alternator and battery. Compare charging rate between battery terminals and the rate between the alternator main post to ground, They should be similar.
4. Bad ground circuits. Check alternator bracket and ground between engine and body.
Saturday, April 10th, 2010 AT 8:45 AM