One inherited problem with 2005 and 2006 Chrysler 300 is flickering headlights caused by a faulty headlight switch. It appears that after several hundred applications of the switch in headlight, park, and dimmer positions - the mechanical terminals or connectors inside the switch becomes pitted an loses contact, creating a "make and break connection" in the headlight circuit. This is a normal wearing condition, and the failure rate appears to be quite numerous for these vehicles.
Before attempting any electrical repairs around or near the dashboard, always 1) disconnect the negative battery terminal and 2) remove the airbag fuse(s). This will prevent accidental deployment of the airbags and the risk of personal injury. If you feel uncomfortable about performing a headlight switch replacement, seek the service of a certified automotive technician.
The headlight switch is designed with an internal circuit-breaker. A circuit-breaker is similar to a fuse, but it is heat sensitive to stop current from flowing during an overload - then it quickly cools and allow current to start flowing again. This fail-safe method allows emergency lighting without total "black-out" of the headlights. Flickering headlights create a road hazard and must be repaired immediately.
The headlight switch can be safely replaced if you follow manufacturer's procedures. The replacement cost for a headlight switch at my local Oreilly's Auto Parts store is $60.00 Make sure you take the old switch with you and/or specify the following: with/without fog lights, with/without automatic headlights, and number of terminals.
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