Headlights on, dash lights off and gauges not working

[skivolks]

When I turn on my headlights the dash lights go out and the turn signal lights come on and the gauges don't work. Also the blue high beam light comes on. I replaced the headlight and dimmer switches. Does anybody know how to fix this? Daily driver for work.

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[Spareparts]

Bad ground probably is my guess.

 

[skivolks]

When I turn on my headlights the dash lights go out and the turn signal lights come on and the gauges don't work. Also the blue high beam light comes on. I replaced the headlight and dimmer switches. Does anybody know how to fix this? Daily driver for work.

You must be registered for see images attach

The truck is running in this picture with the headlights on

 

[skivolks]

Bad ground probably is my guess.

Do you know where to look for the bad ground? Maybe trailer lights?

 

[jd33173]

Bad grounds cause weirdness - if you dont have the manuals they are probably available (free) on this site and it pretty much shows where they all are. I would start there as that is mostly likely what you have going on. If the previous owner had electrical modification proclivities it becomes more character-building.

 

[Spareparts]

Do you know where to look for the bad ground? Maybe trailer lights?

Not a clue.
My best guess is somewhere along the wiring harness anywhere from the front bumper to the rear bumper.

 

[Erik the Awful]

The rear taillight harness is notorious for broken ground issues. If you need a junkyard replacement harness, the pickup harnesses are usually hacked up pretty badly. Suburban harnesses are more often unmolested.