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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 15701
Experience:  Have owned a repair shop for 25 yrs.
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93 silverado 5.7 k2500. Intermittent low-beam fail on both

Customer Question

93 silverado 5.7 k2500. Intermittent low-beam fail on both lights. When I toggle the dimmer to high, then back to low, it turns the lows back on. It seems to start after driving about 10-15 minutes. I have replaced the headlight switch about 6 months ago, when the switch overheated and smoked out while driving during daytime with lights on.
Original owner, 308k miles
Submitted: 1 year ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 1 year ago.

Hi, My name is ***** ***** for the delay.

I will do my best to assist you

so,the dim lights will work intermediately?

Customer: replied 1 year ago.
they go off intermittently. They work well initially, but go off after abt 10-15 minutes. If I hit the hi-beam, then back to low, the low beams work...for about 2-3 minutes, then repeat
Customer: replied 1 year ago.
Is there a relay for the low beams?
Customer: replied 1 year ago.
It acts like something is getting hot and going off, then cools off enough to work for short time
Expert:  Tim's Auto Repair replied 1 year ago.

did it do this with the old switch?

Customer: replied 1 year ago.
No. But new switch worked fine for about 6 months. And it doesn't seem to affect the hi-beams
Expert:  Tim's Auto Repair replied 1 year ago.

sense it will work intermediately,,i think your problem is that new switch,,you may need to replace it again

Customer: replied 1 year ago.
there is no relay? My only concern with replacing the switch is that it doesn't seem to affect the hi-beams
Expert:  Tim's Auto Repair replied 1 year ago.

yes,,i understand

Customer: replied 1 year ago.
again asking: is there a relay for the low-beams?
Expert:  Tim's Auto Repair replied 1 year ago.

it only has the drl relay

Expert:  Tim's Auto Repair replied 1 year ago.

i think you just got a bad new switch[common]

Customer: replied 1 year ago.
Mine has no drl, my understanding for this year is that was only for canadian vehicles
Expert:  Tim's Auto Repair replied 1 year ago.

ok,,here is the headlamp diagram with no drl

Customer: replied 1 year ago.
I'll try replacing the switch...unfortunately, may have to wait for night running to be sure, that's what sucks about the intermittent stuff. I'm trying not to just start replacing stuff, without a positive idea. I agree it's a likelihood this is the problem, just trying to rule out other potentials
Expert:  Tim's Auto Repair replied 1 year ago.

i understand,,it can be really hard to find an intermediate problem

Expert:  Tim's Auto Repair replied 1 year ago.

you do need to check your wire harness to the headlamps before replacing the switch

Customer: replied 1 year ago.
yeah. okay, done here
Expert:  Tim's Auto Repair replied 1 year ago.

no problem

thanks