Headlight fuse?

[Stephen Carter]

So yesterday I lost (stopped working) my drivers headlight (low beam), passenger works just fine, brights work just fine.

Is there a fuse somewhere? I cannot find one in the fuse box, but i know sometimes fuse serve more than one purpose, but may not be labeled as such.

 

[rampage]

So yesterday I lost (stopped working) my drivers headlight (low beam), passenger works just fine, brights work just fine.

Is there a fuse somewhere? I cannot find one in the fuse box, but i know sometimes fuse serve more than one purpose, but may not be labeled as such.

Sounds like the bulb burned out. You can sometimes see the filament broken loose. A blown fuse would’ve made the lights stop working on both sides, not just one.

 

[Stephen Carter]

Sounds like the bulb burned out. You can sometimes see the filament broken loose. A blown fuse would’ve made the lights stop working on both sides, not just one.

Lamp works (power probes rock). Im getting zero voltage at the connectors.

(Could have sworn i put that in there, long day at work sorry)

 

[Bent77]

Lamp works (power probes rock). Im getting zero voltage at the connectors.

(Could have sworn i put that in there, long day at work sorry)

But the other side works?

if that’s the case to have a wire issue

 

[rampage]

Use a jumper wire from the connector on the bulb to where it splices into the passenger side. That should narrow it down to a bad splice, bad connector, or a compromised wire.

 

[dyeager535]

No fuse, the headlight switch has a built in self resetting breaker. Runs essentially straight off the battery, through a fusible link. But losing that link will cause you to lose other lighting (like interior iirc), not just headlights.

 

[Stephen Carter]

No fuse, the headlight switch has a built in self resetting breaker. Runs essentially straight off the battery, through a fusible link. But losing that link will cause you to lose other lighting (like interior iirc), not just headlights.

So the switch probably took a duece on me?

 

[dyeager535]

So the switch probably took a duece on me?

I want to say yes, but I can't recall how the headlight switch is wired up. I'd be kind of surprised if the high (or low) beams weren't fed from the same terminal on the headlight switch. If that is the case, it obviously wouldn't be the switch.

Too hard for me to do on a phone, but if you grab the wiring diagram for your year here: http://67-72chevytrucks.com/vboard/showpost.php?p=5621043&postcount=1
Should be pretty easy to determine how the headlights are wired.

You've made sure your testing tool is connected to a good ground on that side I assume? If I don't see voltage where I expect to, first thing I do is ensure the ground is actually acting as a ground.

 

[frankin5]

Only one feed to the switch. If switch was bad all lights would be out. If only one low beam out and the other on, would say that light was bad, open circuit or terminal. You indicate that the light will work if powered by 12 volts. There could be a bad ground to that light, but you say that the high beam works. Is this a four headlight system or a duel headlight system. have you checked the splice in the wiring loom. Is this the drivers side or passenger side.

 

[1-ton]

No fuse, the headlight switch has a built in self resetting breaker. Runs essentially straight off the battery, through a fusible link. But losing that link will cause you to lose other lighting (like interior iirc), not just headlights.

Is the fusible link wire you are referring to the one at the stater motor?

 

[Stephen Carter]

Only one feed to the switch. If switch was bad all lights would be out. If only one low beam out and the other on, would say that light was bad, open circuit or terminal. You indicate that the light will work if powered by 12 volts. There could be a bad ground to that light, but you say that the high beam works. Is this a four headlight system or a duel headlight system. have you checked the splice in the wiring loom. Is this the drivers side or passenger side.

Its the drivers side headlight, low beam. Guess im gonna have to remember my scanner danner videos lol

 

[diesel4me]

It may be the connector right at the headlamp--I do not drive at night much,and most of the time if I go to,I have to get out and wiggle the connector to get one of the headlights to come on..
They do sell replacement connectors for headlights in the "HELP" section at parts stores..

Square bodies don't have a fuse for the headlights,as stated above the switch has a built in circuit breaker that re-sets itself,if there is a short,the lights will go off and come back on a few seconds later and repeat ..never trucks may have individual fuses for each headlight and high & low beam..
You can test the sealed beam with an ohm meter after unplugging it to see if a filament burnt out..

 

[dyeager535]

Is the fusible link wire you are referring to the one at the stater motor?

It's one of them. There are at least two fusible links, one for lighting and one for ignition.

 

[1-ton]

It's one of them. There are at least two fusible links, one for lighting and one for ignition.

Where is the one for lighting located? Since the one for lighting in my truck is probably the original one I want to replace that one.

 

[1-ton]

Where is the one for lighting located? Since the one for lighting in my truck is probably the original one I want to replace that one.

Never mind. I did a search for the fusible link for the lights, and other dash components and I found it.