headlights freaking me out !!!

[scrappyk5]

when i am driving with my headlights on at night , all is well. when
i go to use my high-beams , the headlights and the high-beams start to flicker and go out. now if i go back to using just the low-beams , all is
fine .

do i have a relay going bad or something going bad ?
if so , what is it ?

 

[cegusman]

Sound like a bad ground for your high beams

 

[diesel4me]

What year??

Could be bad grounds--or the headlight switch,it has a curcuit breaker built into it,instead of a fuse--it will turn on and off if there is a short in the headlight wires,or too much load on it--I sold lots of headlight switches for fire trucks and police cars,the added load of all the extra lamps they used pushed the switches to the limit,and the breaker would cause the lights to flick on and off...do you have off road lights or other non stock lamps added on to your truck??--if so,you may need to wire them to a separate relay and switch..

If your truck is a newer one,it might have a headlight relay for the high beams-(which could be faulty and cause the same symptoms)-I'm not too familiar with 90's and up trucks,I know the newer ones have the lights on constantly whenever the motor is running,they must go thru more switches and relays(if used?) than a "regular" one you turn on manually at night...I think the dimmer switch could be responsible too,might look into that--nothing worse than losing the headlights on a dark road with no streetlamps!

 

[mr_clean]

I've seen the dimmer switch do that on a 78' Caddie before...

 

[Blue85]

I've seen the foot dimmer switches do that. Kinda scary to have the lights turn off in the country at night.

 

[RingMaster4x4]

I've seen the dimmer switch do that on a 78' Caddie before...

this was the casue in my 72 blazer.