97 Sierra HeadLights yes w/DTR PBrake Released, Switch to ON, Headlights turn OFF!

[jay8454]

97 Sierra HeadLights yes w/DTR PBrake Released, Switch to ON, Headlights turn OFF! To give more information on the problem... Release the Parking Brake and the Day Time Running lights turn the Headlights ON (with switch in off position normal). Turn the HeadLight switch to ON the Headlights turn OFF (Not normal). Things I have tried: Check continuity of all fuses on the side of the dash and under the hood. Tested Headlight Relay under the dash and bought a new relay and installed it. Old one made clicking noise just like new one. Jumped up and down while patting head 4 times. Not sure what the problem is? Could the Day Time RunningLights not be letting the power through?   Any thoughts?

Edited May 3, 2021 by jay8454
none

[Brian Lindsey]

i would suggest checking all your grounds, 

[jay8454]

Did, and done no effect as I said, the Daytime running lights come on when the parking brake is released but when the switch is turned to full on the headlight turn completely off. Thank you for the suggestion.

[silveradosid]

https://easyautodiagnostics.com/gm/4.3L-5.0L-5.7L/headlight-circuit-diagram-1

[D-Ray]

Did you check the selector switch? Possibly a loose wire 

[jay8454]

I spent a long time on this problem but finally have fixed it. It was the dimmer switch I changed a year ago. This part is also a turn, cruise, and wiper. $185 part it sucks buying defective parts but it happens. Thanks for any helpful suggestions they were greatly appreciated.