Start by measuring the battery voltage. It should be 12.6 volts. If it's near 12.2 volts, it is discharged. Charge it at a slow rate for an hour. If it's closer to 11 volts it has a shorted cell and must be replaced. You can also get a clue by watching the brightness of he head lights when you try to crank the engine.
Tuesday, February 5th, 2013 AT 11:44 PM