Headlamps Keep Burning Out


#1

I have a 2002 Mazda Protege, which I purchased used in July 2004. The left headlamp burned out last summer, and was replaced, followed by the right headlamp, which went out last October.



About a month ago, both headlamps again burned out, within one week of each other. My local garage replaced both bulbs, and suggested that the previous bulbs, which had been installed at 2 different auto parts stores, may have been touched during installation, and damaged in the process, causing them to burn out in such a short time. A few days ago I noticed that my left headlamp is out again. Any suggestions as to what may be causing the chronic burnout?



Thanks!


#2

Touching the bulbs during installation will shorten their life, but we must assume the most recent installation was done correctly.

I think it’s time to start measuring voltage at the head lamp bulb socket and checking the connections, including ground(s), in the circuit.


#3
First start the car and turn on the lights.  Now measure the voltage at idle and at speed.  Tell us what that voltage is.

#4

Is there any condensation inside the headlight housings? Water condensation in the left headlight housing of my 2000 Blazer was causing bulbs to fail. I removed the entire housing from the truck and used a hair dryer to dry out the inside of the housing. I then applied silicone at the clear lense/housing joint to seal any cracks.

Ed B.