You can have your alternator tested for free at many auto parts stores such as O'Reilly Auto Parts or AutoZone. If your alternator is good then it is probably your ignition switch. Below are procedures on removal and installation of the switch.
Disconnect the negative battery cable.
Put the ignition switch in the Accessory (ACC) position.
Although not absolutely necessary, you may wish to remove the ashtray and radio at this point for ease of access.
Insert a wire into the small hole in the face of the lock cylinder. Push in on the wire to depress the plunger. Continue turning the key until the cylinder can be removed from the switch.
Remove the switch bezel nut, and then pull the switch out from under the dash.
Go in from the front of the switch with a screwdriver and unsnap the theft resistant locking tangs on the connector and then unplug the connector.
Engage the electrical connector to the switch, then position the switch under the dash and install the switch bezel nut.
Install the lock cylinder to the switch. It most applications, the key should be installed and turned to the ACC, START or RUN positions in order to install the cylinder. If in doubt, check the switch or cylinder manufacturer's instructions, as applicable.
Once the cylinder is installed, turn the key back to the LOCK position.
Connect the negative battery cable, then verify proper switch and cylinder operation.
FYI- The ignition switch is where the key is inserted on the steering column.
Hope this helps.
Saturday, November 8th, 2008 AT 7:48 PM