Headlights not working

The tachometer and speedometer will quit working while driving and the pu does not have full power. We have to stop, shut the pu off of a minute, then restart. It usually fixes the problem. Also, when driving at night with high beam headlights the lights will go off. Eventually they will come back on.

Okay, a couple of months ago I was working late and went to leave work and had no running lights as in tail and marker lights. So I had about fifty miles to drive home and all interstate mile I decided to go with my headlights and flashers and hope for the best. About ten miles down the road my flashers stopped flashing and were stuck on then completely stopped working, but I still had headlights and brake lights. One other thing the DRL's have not worked for about four years and I never worried about it because I really did not care. So I made the decision to pull into an auto parts store and see if I could fix this. First trip in I bought fuses and a flashlight. All the fuses were good and no headlight fuse could be found. So I thank GM for making it easy to remove the headlight switch almost by hand. I unplugged the switch looked it over and started jumping wires on the plug. The first one I got the marker lights. I went back in and they had a switch and I bought it and installed and I was on my way but with no flashers but hey at least I could be seen. So little did I know that this is the easy part. I installed a new flasher the next day and thought I was good, Less than a week later I lost my headlights after dark so I ran my flashers home. Since then I did some research and decided to take care of the DTR's too. I then changed the relay and the module for the DTR's diode. I got running lights and still no headlights or high-beams. More research pointing to the multi-switch on the steering column. Changed that. Still no headlights but every thing still works. Maybe I got a bad headlight switch. Next I pulled the plug on the new switch and started jumping wires again and the running lights came on and a couple terminals down the headlights came on and I pulled the lever for the high beams and they worked, must be I got a bad switch. Put a new one in and no headlights.

Any Ideas?

Thanks Roy, that module is one of the first things I changed along with the relay under the dash next to the flasher relay. I did get my daytime running lights after I replaced the module.

1997 3500 hd headlights will not come on but dtrs still work as do marker lamps. New main switch what could it be?

Low beams quit working, tested the headlights to see if they were good, they were, checked fuses, replaced the multi-function switch, the low beams came on then all of a sudden they quit working, checked everything out again but they still won't work? Any help would be appreciated,

Actually the truck is a 1500 pickup, we checked the DRL relay and the switch is between 3 & 4 which according to the diagram on the switch is correct. Thank you. Shirley

thanks

Hello! We ended up replacing the DRL relay and guess what our headlights are working, thank you so much for your quick response and all your help.
Shirley

When you turn the switch, head lights will not come on, No High or low beam. The parking lights work. When you hit the passenger side blinker, you get a fast flashing turn signal. I checked all the bulb's and they are working. I checked the fuses and they all look good. Any suggestions will be greatly appreciated.

I got the blinker light resolved, it was a bad bulb. Still no head lights, I repalced the switch, still no head lights. Any other suggestions?

Strange things occuring with left turn signal recently, now all of a sudden my rear lights are out compleltely, though front lights are working.

You stated I should check the turn/hazard switch re front lights work/rear not working. Where is this switch located? Thank you.