i don't know what the problem is!? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stevingreen · 03-10-2010, 10:35 AM

I have just recently done a ground up restoration on a 1969 gmc 3/4 ton 4x4 and when i drive with my brights on, after about 5 mins. they start flashing on and off really fast and just start freaking out like that. i will turn the brights off for a while, then turn them back on and they will work for about 5 mins. again until they do this again... what can be the problem!! this is really frusterating for me!!

**LockDoc** · 03-10-2010, 10:51 AM

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I take it that both lights are doing it. To me that would rule out the sockets on the back of the bulbs.

I would say it's a connection that is heating up, or possibly the contacts inside the light switch, or maybe the dimmer switch.... Quite a few possibilities here. I would start with the dimmer switch because it is the easiest part to replace. Make sure that the contacts inside the plug are not corroded on it. Maybe a place to start anyway.

LockDoc

**VetteVet** · 03-10-2010, 10:53 AM

There is a circuit breaker on the back of the headlight switch that is probably getting overloaded by the power needed to run your brights. Did you go to some custom lights when you did the restoration? If so you may want to do the relay upgrade to your headlights.

geezer#99 · 03-10-2010, 10:57 AM

I had the same thing happen years ago on an old chevelle. Was the voltage regulator. It can't handle the load so trips in and out.

03-10-2010, 10:35 AM	#1
stevingreen Registered User Join Date: Jul 2009 Location: arlington, wa Posts: 7	i don't know what the problem is!? I have just recently done a ground up restoration on a 1969 gmc 3/4 ton 4x4 and when i drive with my brights on, after about 5 mins. they start flashing on and off really fast and just start freaking out like that. i will turn the brights off for a while, then turn them back on and they will work for about 5 mins. again until they do this again... what can be the problem!! this is really frusterating for me!!

03-10-2010, 10:51 AM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,773	Re: i don't know what the problem is!? - I take it that both lights are doing it. To me that would rule out the sockets on the back of the bulbs. I would say it's a connection that is heating up, or possibly the contacts inside the light switch, or maybe the dimmer switch.... Quite a few possibilities here. I would start with the dimmer switch because it is the easiest part to replace. Make sure that the contacts inside the plug are not corroded on it. Maybe a place to start anyway. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

03-10-2010, 10:53 AM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,718	Re: i don't know what the problem is!? There is a circuit breaker on the back of the headlight switch that is probably getting overloaded by the power needed to run your brights. Did you go to some custom lights when you did the restoration? If so you may want to do the relay upgrade to your 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.

03-10-2010, 10:57 AM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,731	Re: i don't know what the problem is!? I had the same thing happen years ago on an old chevelle. Was the voltage regulator. It can't handle the load so trips in and out.

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