Measure the exact battery voltage with a digital voltmeter. If you find near 12.6 volts, suspect a bad connection on one of the large cables going to the starter or engine block. If you find closer to 12.0 volts, the battery is good but discharged. At 11 volts or less, suspect a shorted cell in the battery. It will still be enough to make the head lights appear normal but it won't be able to supply the starter with enough current. At five years old, it's about time for a new battery.
When the engine is running, you can check the charging system by remeasuring the battery voltage. It must be between 13.75 and 14.75 volts. If it is low, the battery will not be recharged while driving.
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Monday, December 6th, 2010 AT 12:53 AM