Blowing headlight - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 13 (permalink) Old Feb 18th, 19, 6:27 PM Thread Starter
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Blowing headlight

We rarely rarely use our headlights. In the fall I noticed the driver's headlight out. No big deal. I went ahead and bought both stock replacements from Autozone and changed them out. Turned them on to check them and both were fine. Fast forward several months to last night. When we turned them on for the first time the driver's one was out again. We have never used them since the new ones were installed. What should I check? The engine, transmission etc. on this car has been highly modified but to the best of my knowledge the wiring for the lights, etc. is all stock.
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post #2 of 13 (permalink) Old Feb 18th, 19, 6:39 PM
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Re: Blowing headlight

Voltage while running. Should be about 13.5 to 14.5 volts. Bad alternator or regulator could be the cause.

Maybe crappy headlights or bad luck.

Check the plugs at the back of the headlight for power or corrosion. Maybe the light is good and you have a wiring issue.
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post #3 of 13 (permalink) Old Feb 18th, 19, 6:44 PM
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Re: Blowing headlight

Are you sure the bulb is the problem? Maybe it's not getting power or ground.
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post #4 of 13 (permalink) Old Feb 19th, 19, 2:45 AM
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Re: Blowing headlight

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Originally Posted by Dean View Post
Are you sure the bulb is the problem? Maybe it's not getting power or ground.
Or the splice junction where the 2 sets of wires meet.

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post #5 of 13 (permalink) Old Feb 19th, 19, 8:08 AM
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Re: Blowing headlight

Wiggle the headlight connector. I've got the original harnesses for the headlights on my 64, headlights are white and bright normally but loose connection over time. Quick wiggle and they're back on.

Chances are your old headlights are fine and not blown.

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post #6 of 13 (permalink) Old Feb 19th, 19, 8:26 AM
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Re: Blowing headlight

Are you sure the headlights them selves actually don't work? It sounds almost like somewhere in the wiring is bad.
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post #7 of 13 (permalink) Old Feb 19th, 19, 10:08 AM Thread Starter
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Re: Blowing headlight

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Originally Posted by Hotwire View Post
Wiggle the headlight connector. I've got the original harnesses for the headlights on my 64, headlights are white and bright normally but loose connection over time. Quick wiggle and they're back on.

Chances are your old headlights are fine and not blown.
Haven't tried that yet but definitely will before I pull the headlight out. Thank you.

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post #8 of 13 (permalink) Old Feb 19th, 19, 10:24 AM
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Re: Blowing headlight

To confirm the bulb is blown and not the harness or plug, swap it to the plug on the other side of the car.
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post #9 of 13 (permalink) Old Feb 19th, 19, 10:33 AM
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Re: Blowing headlight

Or check the bulb continuity with a multimeter. Then check for constant voltage at the lamp socket, with the headlamp switch “on”.
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post #10 of 13 (permalink) Old Feb 19th, 19, 10:39 AM
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Re: Blowing headlight

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Originally Posted by paul bell View Post
To confirm the bulb is blown and not the harness or plug, swap it to the plug on the other side of the car.
This is the type of diagnostics that a Power Probe ( probably others ) is an awesome tool. You can test the head light independent of the car without removing it, and test your voltage or ground etc.

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post #11 of 13 (permalink) Old Feb 19th, 19, 11:27 AM Thread Starter
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Re: Blowing headlight

I have a nice voltmeter but to be honest am a novice when it comes to electrical troubleshooting. What exactly should I do to test the bulb and plug?

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post #12 of 13 (permalink) Old Feb 19th, 19, 2:15 PM
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Re: Blowing headlight

Also check the mount, a headlight bucket that isn't snug will vibrate and destroy the filament.

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post #13 of 13 (permalink) Old Feb 19th, 19, 2:40 PM
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Re: Blowing headlight

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Originally Posted by Tar Heel View Post
I have a nice voltmeter but to be honest am a novice when it comes to electrical troubleshooting. What exactly should I do to test the bulb and plug?


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