headlight problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

krazy_texan · 03-02-2005, 09:29 PM

help me i cant drive my truck because my headlights dont work when i pull the switch all of the lights come on but the headlights, i have done the relay conversion some time back could my relays be bad, sometimes the headlights come on but that is just like a fluke maybe on out of 50 times pulling the switch, what could this be.

1STtimePRo'71 · 03-02-2005, 09:38 PM

Grounds? Have you checked those? Also I had the same problem and replaced both bulbs, dimmer switch, and headlight switch. I dont know which one of those three solved the problem but I'm driving at night now. Just replace everything

I'm kinda funny that way. One little thing always turns into a big project.

Mountain Man · 03-02-2005, 09:40 PM

Undo the headlight switch harness and check for power to the headlight switch from the headlight wire with it in the on position. I suspect that you probably have a bad headlight switch if it is intermittant. I bought a new one recently in Canada for $24 Canadian.

JBstor · 03-02-2005, 09:45 PM

KT,

I am not a pro at this, but if you have a voltmeter, find a good ground, and work your way back from the lights. As soon as you get power, you will know where to look for bad connections and such. I would bet it is the relay, or the switch, but you can also have a bad dimmer. Check all the connections and then start looking for power.

HTH
JB

Longhorn Man · 03-02-2005, 09:50 PM

Odds are it is the dimmer switch and or the plug going to it.

Gary Lee · 03-02-2005, 10:50 PM

it was like, if I played with it turned the lites on and off... sometimes after 5-10 times they would come on... this was an intermittent problem until... my lil trick didn't werk anymore... It was the dimmer switch, but not before it fried the plug... melted it to the dimmer switch... had to use a generic 2 prong from advance and then use a 3rd single blade plug, werks like a charm...

I don't have the relay set up yet, but I will in the upcoming months as, I'm waitng on the wiring harness stuff until, I pull the gauges...

gas gauge question? is it normally the gauge or sending unit...

i would guess the sending unit would go, but what is everyones experience on this one?

03-02-2005, 09:29 PM	#1
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	headlight problem help me i cant drive my truck because my headlights dont work when i pull the switch all of the lights come on but the headlights, i have done the relay conversion some time back could my relays be bad, sometimes the headlights come on but that is just like a fluke maybe on out of 50 times pulling the switch, what could this be. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-02-2005, 09:38 PM	#2
1STtimePRo'71 Registered User Join Date: Feb 2005 Location: Lake Crystal, MN Posts: 656	Grounds? Have you checked those? Also I had the same problem and replaced both bulbs, dimmer switch, and headlight switch. I dont know which one of those three solved the problem but I'm driving at night now. Just replace everything I'm kinda funny that way. One little thing always turns into a big project. __________________ -Cory 1967 2 Wheel Chevy

03-02-2005, 09:40 PM	#3
Mountain Man Registered User Join Date: Jan 2002 Location: Calgary, Alberta, Canada Posts: 451	Undo the headlight switch harness and check for power to the headlight switch from the headlight wire with it in the on position. I suspect that you probably have a bad headlight switch if it is intermittant. I bought a new one recently in Canada for $24 Canadian. __________________ 72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components.

03-02-2005, 10:50 PM	#6
Gary Lee fixer of 72 GMC LWB Join Date: Feb 2005 Location: Newnan GA Posts: 111	ah ha... i had this happen to me... it was like, if I played with it turned the lites on and off... sometimes after 5-10 times they would come on... this was an intermittent problem until... my lil trick didn't werk anymore... It was the dimmer switch, but not before it fried the plug... melted it to the dimmer switch... had to use a generic 2 prong from advance and then use a 3rd single blade plug, werks like a charm... I don't have the relay set up yet, but I will in the upcoming months as, I'm waitng on the wiring harness stuff until, I pull the gauges... gas gauge question? is it normally the gauge or sending unit... i would guess the sending unit would go, but what is everyones experience on this one?

03-02-2005, 09:45 PM	#4
JBstor Registered User Join Date: Feb 2005 Location: Winnipeg, Manitoba, Canada Posts: 66	KT, I am not a pro at this, but if you have a voltmeter, find a good ground, and work your way back from the lights. As soon as you get power, you will know where to look for bad connections and such. I would bet it is the relay, or the switch, but you can also have a bad dimmer. Check all the connections and then start looking for power. HTH JB

03-02-2005, 09:50 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Odds are it is the dimmer switch and or the plug going to it.



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