Use a digital multimeter across battery posts, everything off. The generic spec for a full charge is around 12.6 volts. You can also leave the meter leads hooked to battery posts, have helper turn key to crank. If the voltage reading drops below about 9 volts, have the battery tested and charged. You also need to check the charging system. Make sure all battery connections are clean and tight on both ends.
Any applicable trouble codes? What about your security system, where applicable?
Tuesday, November 13th, 2012 AT 7:26 PM