Need Headlight Help Please!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wldcat10 · 06-22-2011, 04:37 PM

Hey guys I need help! I was checking out my water pump on my '70 c-10 the other day just before it got dark out. So I checked it and took it for a spin around the block. When I went to turn on the headlights, they didnt turn on! All other lights are working. Parking lamps, tail lights, and side markers are all on and working. Only my headlights are out. I've never had this happen and don't know where to start? Any Ideas on what it could be? Any help is appreciated, thanks!

70truckguy · 06-22-2011, 04:57 PM

Try kicking the dimmer switch back and forth from bright to dim a couple of times. They seem to go out every few years. Be rough with it.

**VetteVet** · 06-22-2011, 05:19 PM

Check the blue wire at the dimmer switch for power. If you have power on it then pull the plug on the dimmer and jump the blue wire to either the tan wire or the green wire and see if the headlights come on. If they do then the dimmer switch is bad and if they don't then the problem is in the wiring from the dimmer switch to the headlights.

bobs409 · 06-23-2011, 06:37 AM

Pull switch to on position and wiggle connectors at the back of each headlight. I've found that dirty connections there are quite common.

72BLUZ · 06-23-2011, 07:15 AM

mine did that very same thing, ended up having to install a new switch

mrein3 · 06-23-2011, 07:33 AM

If the switch or the plug to the switch is bad, do the headlight relay upgrade. WAY too much current flows through those wires. High current = heat = voltage loss = melted plugs and dim, yellow headlights.

A simple search in this forum for "headlight relay upgrade" will yeild many posts and many diagrams on how to do it.

cdowns · 06-23-2011, 10:13 AM

a common problem is the connector to the dimmer switch// the wires tend to get brioke off and no power to dimmer switch result in no headlights

wldcat10 · 06-24-2011, 01:08 PM

Thanks everyone for thr input!

**leddzepp** · 06-24-2011, 01:24 PM

Quote:

Originally Posted by bobs409

Pull switch to on position and wiggle connectors at the back of each headlight. I've found that dirty connections there are quite common.

This would be my guess.

06-22-2011, 04:37 PM	#1
wldcat10 Registered User Join Date: Apr 2010 Location: Tucson, Arizona Posts: 157	Need Headlight Help Please!!! Hey guys I need help! I was checking out my water pump on my '70 c-10 the other day just before it got dark out. So I checked it and took it for a spin around the block. When I went to turn on the headlights, they didnt turn on! All other lights are working. Parking lamps, tail lights, and side markers are all on and working. Only my headlights are out. I've never had this happen and don't know where to start? Any Ideas on what it could be? Any help is appreciated, thanks! __________________ 1970 CST/10 LWB 350 1984 Blazer

06-22-2011, 04:57 PM	#2
70truckguy Registered User Join Date: Feb 2011 Location: Lipan, Texas Posts: 52	Re: Need Headlight Help Please!!! Try kicking the dimmer switch back and forth from bright to dim a couple of times. They seem to go out every few years. Be rough with it. __________________ Rich 1970 C/10 Step, 383/700R4 http://67-72chevytrucks.com/vboard/s...d.php?t=466601 Last edited by 70truckguy; 06-22-2011 at 04:57 PM.

06-22-2011, 05:19 PM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,709	Re: Need Headlight Help Please!!! Check the blue wire at the dimmer switch for power. If you have power on it then pull the plug on the dimmer and jump the blue wire to either the tan wire or the green wire and see if the headlights come on. If they do then the dimmer switch is bad and if they don't then the problem is in the wiring from the dimmer switch to the headlights. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

06-23-2011, 06:37 AM	#4
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Re: Need Headlight Help Please!!! Pull switch to on position and wiggle connectors at the back of each headlight. I've found that dirty connections there are quite common. __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

06-23-2011, 07:15 AM	#5
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: Need Headlight Help Please!!! mine did that very same thing, ended up having to install a new switch __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan

06-23-2011, 07:33 AM	#6
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	Re: Need Headlight Help Please!!! If the switch or the plug to the switch is bad, do the headlight relay upgrade. WAY too much current flows through those wires. High current = heat = voltage loss = melted plugs and dim, yellow headlights. A simple search in this forum for "headlight relay upgrade" will yeild many posts and many diagrams on how to do it. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

06-23-2011, 10:13 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Need Headlight Help Please!!! a common problem is the connector to the dimmer switch// the wires tend to get brioke off and no power to dimmer switch result in no headlights __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

06-24-2011, 01:08 PM	#8
wldcat10 Registered User Join Date: Apr 2010 Location: Tucson, Arizona Posts: 157	Re: Need Headlight Help Please!!! Thanks everyone for thr input! __________________ 1970 CST/10 LWB 350 1984 Blazer



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