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Driver side low beam getting too much voltage. Help!

Mpereira93

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Mpereira93 New Member

Mpereira93

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Never had a problem like this before. I have led bulbs installed and noticed yesterday my driver side one was dim. After measuring the connector with a multimeter I noticed there were 14v going to the low beam which I know isn't normal. Checked all my fuses (that I could find) and they're all good, anyone have any ideas? Thanks in advance 

papageoff Enthusiast

papageoff

Posted
Posted
Never had a problem like this before. I have led bulbs installed and noticed yesterday my driver side one was dim. After measuring the connector with a multimeter I noticed there were 14v going to the low beam which I know isn't normal. Checked all my fuses (that I could find) and they're all good, anyone have any ideas? Thanks in advance 
Why is 14v too high? An automotive "12v" system really operates at around 13-14.7v.

Not sure why it's dim... I think these trucks use pulse width modulation (pwm) and if the duty cycle is low, that would manifest as a dim bulb and wouldn't likely show up on a multimeter. You need an o'scope to accurately measure duty cycle.

That said, a low duty cycle isn't necessarily a failure condition. It could be the truck is intentionally dimming the lights, maybe for drl, for instance.

Sent from my SM-G892A using Tapatalk

Mpereira93 New Member

Mpereira93

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Its never been dim like it is now and the passenger side low beam is bright like it always has been. I tried putting in the original low beam bulb and the bulb began smoking. Maybe 14v is normal, i just found it odd once the bulb started to smoke

papageoff Enthusiast

papageoff

Posted
Posted
Its never been dim like it is now and the passenger side low beam is bright like it always has been. I tried putting in the original low beam bulb and the bulb began smoking. Maybe 14v is normal, i just found it odd once the bulb started to smoke

Hahaha... Okay then!

 

Sent from my SM-G892A using Tapatalk

 

 

To be clear, I'm not laughing at your problem. Sorry.

 

That does sound weird and I have no suggestions there. The fuse should have popped before anything on the circuit gets damaged.

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