Dim left headlight not the bulb help again please. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**yellowblazer1969** · 03-17-2009, 04:55 PM

Just noticed the left headlight is dim hooked up another one and same thing, the driverside is normal i have no ideas. Painless harness installed about 5 years ago, checked the fuses but no dice. just got the truck back on the road from a new engine install, could this be a wiring problem with the light harness?

thanks

Longhorn Man · 03-17-2009, 05:00 PM

most likely it is a faulty ground. No clue where the aftermarket one grounds, but follow the pigtail to where it bolts to something (coresupport if it is like the original), unbolt it and clean/sand the metal. Reconnect it and see if that fixes it.
It's getting power, we know this becouse it lights up. But the power must have a good ground.

BLACK AND BLUE 67-72 · 03-17-2009, 05:20 PM

Check your ground!!

cparman · 03-17-2009, 05:25 PM

the 3 wire connector that attaches to the headlight SHOULD have a light green, black, and brown wire. If so, and if it is a painless harness, they will be marked every 5 inches or so. They will say high beam head lamp, ground, low beam head lamp. I would pull the headlight and see if the wiring is marked as I describe. If so, I would think the black will say ground, and be grounded to the radiator support close to the headlights. Just worked on a 50 Chevy with painless wiring and this is what I found.

**yellowblazer1969** · 03-17-2009, 06:02 PM

Found it!! yall were right, the ground was loose at the firewall. The truck has been sitting for a while untill recently so i expect i will have plenty more questions as i continue to revive her.

thanks, again

LONGHAIR · 03-17-2009, 07:13 PM

Man, I sure wish they were all that easy.............

03-17-2009, 04:55 PM	#1
yellowblazer1969 Registered User Join Date: Jul 2004 Location: columbia sc Posts: 387	Dim left headlight not the bulb help again please. Just noticed the left headlight is dim hooked up another one and same thing, the driverside is normal i have no ideas. Painless harness installed about 5 years ago, checked the fuses but no dice. just got the truck back on the road from a new engine install, could this be a wiring problem with the light harness? thanks

03-17-2009, 05:00 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Dim left headlight not the bulb help again please. most likely it is a faulty ground. No clue where the aftermarket one grounds, but follow the pigtail to where it bolts to something (coresupport if it is like the original), unbolt it and clean/sand the metal. Reconnect it and see if that fixes it. It's getting power, we know this becouse it lights up. But the power must have a good ground.

03-17-2009, 05:20 PM	#3
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Dim left headlight not the bulb help again please. Check your ground!! __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

03-17-2009, 05:25 PM	#4
cparman sharp as a marble Join Date: Jan 2007 Location: atlantic beach,florida Posts: 1,082	Re: Dim left headlight not the bulb help again please. the 3 wire connector that attaches to the headlight SHOULD have a light green, black, and brown wire. If so, and if it is a painless harness, they will be marked every 5 inches or so. They will say high beam head lamp, ground, low beam head lamp. I would pull the headlight and see if the wiring is marked as I describe. If so, I would think the black will say ground, and be grounded to the radiator support close to the headlights. Just worked on a 50 Chevy with painless wiring and this is what I found.

03-17-2009, 06:02 PM	#5
yellowblazer1969 Registered User Join Date: Jul 2004 Location: columbia sc Posts: 387	Re: Dim left headlight not the bulb help again please. Found it!! yall were right, the ground was loose at the firewall. The truck has been sitting for a while untill recently so i expect i will have plenty more questions as i continue to revive her. thanks, again



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