Headlights wont come on?

Maybe a problem dimmer/multi-function switch? Did you test for voltage, anywhere?

Just to add, if you fool with the steering column, disarm the air-bag first. Another thought is the headlamp switch, there is circuit breaker in the headlamp switch. Note the voltage wires in the diagram, check for voltage when problem is ongoing.

Sorry wrong diagram.

Yes, the insane engineers have seen fit to hang an unnecessary, unreliable, expensive computer onto every conceivable system, but luckily your truck still has a common sense and simple circuit. The "flash-to-pass" is on a separate part of the headlight switch. If the high beams work normally, the headlight switch is okay. Since the flash-to-pass function works, we know the 30 amp fuse has to be okay too.

If the high beams work properly, (not the flash-to-pass function), go to the next paragraph. If the low and high beams do not work, go to the headlight switch or the dimmer switch and check for voltage on the light green wire. You should find 12 volts there with the headlight switch turned on.

If you have voltage coming out of the headlight switch, check on the red/orange and violet/white wires at the multi-function switch. One or the other should have 12 volts when you activate the dimmer switch. Let me know what you find missing.

Are the parking lights, rear lights, license plate lights working? Have you checked the headlight socket for power? Have you checked the switch itself?

Good morning,

I attached a wire diagram of the headlight switch. You need to verify power coming out of the switch for the headlights and park lights in the on position.

https://www.2carpros.com/articles/how-to-check-wiring

if all outputs are good, you have a wiring issue to the lights.

As far as the dead battery, it sounds like you have a parasitic draw test done to see what has caused the battery to drain.

https://www.2carpros.com/articles/car-battery-dead-overnight

Roy

Are we talking about a new issue?

What are the results of the lights issue?

Roy

Do you have an alarm system in the truck? That would explain the lights flashing on and off.

Did you check the battery voltage? Use a voltmeter and check the voltage.

Roy

Those are three different switches. With multiple non-working systems, start by checking the large fuses in the under-hood fuse box. You need to list the engine size and transmission type so I can look up the correct wiring diagram.

Okay, then we need to look at the starting system.

Remove the relay and test for power with the key on. Terminal 30 should have power.

Then turn the ignition to start and terminal 85 should have power as well.

Roy

Viper is a brand of an alarm system.

Any place that installs alarm systems can remove it for you.

Roy